Authorities say a 3-year-old Florida boy has died after shooting himself with a gun he found in his uncle's backpack.

The shooting happened Tuesday night in a bedroom Jadarrius Speights shared with his uncle at an apartment complex in Tampa. Authorities say the uncle, 29-year-old Jeffrey D. Walker, has been charged with culpable negligence.

It wasn't immediately clear whether Walker had an attorney. His phone number was not listed and jail records didn't give a lawyer for him.

Police say he has a concealed weapons permit.

Hillsborough County sheriff's spokeswoman Debbie Carter says the uncle was not in the room when the shooting happened, but the child's parents were there. The boy was taken to a hospital where he died.

Last week, a 5-year-old Kentucky boy who received a .22-caliber rifle as a gift accidentally shot and killed his 2-year-old sister, according to state police.

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NBC 6 South Florida

A 6-year-old girl was shot by her 13-year-old brother in Oakland Park according to investigators.

A six-year-old Florida girl was in critical condition Sunday after being shot by her 13-year-old brother Saturday night in a city just north of Fort Lauderdale.

Neighbors said the two children were playing a game when the shooting occurred shortly before 7 p.m. Saturday in Oakland Park, a city in Broward Country.

"They were playing hide and go seek. I don't know how it went down but he shot his sister," said neighbor Peter Milano, who saw a frantic woman he thought was the children's aunt running down the block.

"She came up to me 'Is she ok? Is she ok?' At the time I didn't know what she was talking about," Milano said.

It's not clear if authorities will pursue criminal charges in the case. Detectives believe the shooting was accidental but were still trying to determine exactly how the teen got access to the gun. The children were home alone at the time of the incident, said Dani Moschella, a spokeswoman for the Broward Sheriff's Office.

Homicide detectives spent time talking with the 13-year-old. Neighbors said he drew pictures for investigators as he described what happened.

"The kid's probably, well, how could you feel, you just shot your sister?" Milano said.

Though detectives are specially trained to deal with the most sensitive situations, Moschella said the fact that two children are involved made this job that much more difficult.

"It is very difficult when dealing with children, specifically children who've been through a very traumatic situation," she said. "This family will never be the same after tonight, no matter how it ends up."

The 6-year-old is in critical condition at Broward Health Medical Center.

A father who was cleaning his shotgun accidentally shot his 10-year-old son to death at their home in North Carolina.

Christopher Stanlane was wiping the gun down Sunday afternoon when he shot the boy in the head, Capt. Anthony Thompson of the Robeson County Sheriff’s Office told NBC affiliate WMBF.

Stanlane dropped his gun and rushed his 8-year-old daughter to another room while his wife called 911.

The son, Christopher Jr., was pronounced dead by paramedics at the house in the town of Fairmont.

“Most people think that guns are what kill people, and it’s not,” said Sgt. Eric Gavaghan, another county sheriff’s official, who teaches gun safety classes. “The people and their inexperience, their lack of training, that’s what hurts other people with firearms.”

A 10-month-old boy was shot and killed by his father Thursday in an apparent accident at a Nashville, Tenn., hotel, local media reported.

Two police detectives from the Hermitage Precinct were close to the hotel when the call went out and made it to the scene within about three minutes but were unable to resuscitate the child, NBC affiliate WSMV-TV Channel 4 reported.

The child's mother Jacquelin Bass, 28, and the couple's other sons, aged 3 and 2, were in the room when the gun went off, the station said.

The baby was shot once in the chest as his father, Larry Bass, 30, handled the semi-automatic handgun, the Nashville Tennessean reported.

NBC News was unable to independently confirm the accounts early Friday.

Both news outlets reported that the family, from Texas, was at the Extended Stay America hotel near Nashville International Airport when the incident happened. Larry Bass was in town to work on construction of the Music City Center, a 1.2-million-square foot convention center.

The newspaper said the family had checked in on Jan. 29.

Ten-month-old Adam Bass would have had turned 1 in May, the Tennessean reported, quoting police spokesman Don Aaron as saying that the family was "very, very distraught over what's happened" and that "the police department does not believe this was an intentional act."

Attempts to reach the police department were unsuccessful early Friday. WSMV said a police investigation was continuing.

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A disturbing video of teenagers pointing a gun at one of their peers, taunting him, has led to a police investigation in New Mexico.

The video, in which a reportedly autistic boy is cornered in a bedroom while another kid holds a weapon up to his face, shows at least two other teens laughing and yelling.

One, referring to the gun, says "It's f***ing loaded, b*tch," then props his foot up on a bed. He tells the boy, "Kiss my shoes." The other says, "dude, you better f***ing kiss his shoe."

NBC affiliate KOB.com reported the video was recorded in January, but only recently posted onto Facebook. The father of the boy who was being taunted shared the video, which was taken down from Facebook, with the news station; the faces of all the teens have now been blurred to protect their identities.

The 16-year-old boy who was being terrorized in the video was autistic, his father told KOB.com.

Calls from NBC to the Los Alamos police department were not immediately returned, but the school district confirmed the incident took place at a house in Los Alamos, off of school grounds.

"There were not any arrests," Los Alamos Superintendent Gene Schmidt said. "Two detectives did come onto our campus to interview potential witnesses. From what I understand, later on, a citation was issued."

KOB.com reported that the teen with the gun was charged with aggravated assault, but it was not clear if the other teens faced charges or if anyone was physically harmed.

The students all attended Los Alamos High School, Schmidt said.

He couldn't comment on disciplinary action in the case, but said, "We do have an active protocol when the school is concerned that bullying may or may not be taking place. We work very actively to set up a safety plan for those people involved. ... Our administrative team was aware of this investigation, and a parallel universe was developed in which safety plans for students at the high school was developed and deployed." 

Police are investigating how a 5-year-old boy was shot in the shoulder in his home in The Bronx, New York City, Friday, authorities said.

The boy's mother and father were in their bedroom in Morrisania when they heard a pop noise shortly after 10:30 a.m., police said.

They rushed to their 5-year-old son's room and found him shot.

Police said it was not clear if the boy accidentally shot himself or if his 11-year-old brother accidentally shot him.

The father drove the boy to nearby Lincoln Hospital, where he was listed in stable condition.

The investigation was continuing.

Michelle Obama will travel to Chicago on Saturday and attend the funeral of a 15-year-old girl gunned down last week in Chicago, the White House confirmed Friday.

The first lady was not expected to speak, sources told NBC Chicago.

Senior Adviser Valerie Jarrett and Secretary of Education Arne Duncan will also make the trip from Washington, D.C., to attend the service for Hadiya Pendleton at the Calahan Funeral Home on the 7000 block of South Halsted Street.

"That's a step in the right direction," the Rev. Jesse Jackson said Thursday. "Their coming give us a sense that somebody at the highest levels of government cares, and that is a big deal."

Pendleton was killed last Tuesday at Kenwood Park on the city's South Side days after she performed at some of President Barack Obama's recent inauguration festivities.

She was shot to death blocks from her school and about a mile from the president's and first lady's Chicago home.

"After all, this is in her neighborhood. This is less than a mile from the First Lady's house, and her children must walk these same streets, and so I'm sure that Michelle is acutely sensitive to just how close this is to her own family," Jackson said.

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Police Supt. Garry McCarthy said he believes Michelle Obama's visit "is rightfully bringing attention to the problems that every urban center in this country is experiencing every single day."

The reward leading to Pendleton's killer stands at $40,000.

A petition was started asking that Obama attend the funeral. Unconfirmed reports earlier this week said Michelle Obama had considered attending.

The Pendleton family's pastor confirmed the president called Hadiya's parents to offer his sympathies.

"We thank him for that, and if he does come, that's fine," Pastor Courtney Maxwell said. "If he doesn't, we know he sends his love."

Illinois Gov. Pat Quinn also will attend the funeral, set for 9 a.m. Saturday at the Greater Harvest Baptist Church, at 5141 S. State St.

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Family of slain Chicago teen Hadiya Pendleton preparing for her funeral

A couple with four children were shot and killed in an argument over dog feces on Monday, police in Texas said.

Officers were called to a shooting at the Sable Ridge Apartments in Dallas at about 8 a.m. Monday.

When officers arrived, they found two people, later identified as 32-year-old Michelle Jackson and 31-year-old Jamie Stafford, dead at the scene from apparent gunshot wounds.  An infant inside the couple's apartment was not injured.

After talking with witnesses, police began searching for Chung Kim, a resident of the complex identified by residents as a man who lived in the unit below Stafford and Jackson and was seen leaving the complex after the shooting.

Police later located Kim in his black Lexus SUV nearby and took him into custody.

Investigators said the couple had been dumping dog feces on the patio and at the front door of Kim's apartment.

Read more from NBCDFW.com

Police said Kim pulled out a gun and shot Jackson as she stood on her balcony. Police said Kim then went upstairs and into the couple's apartment and shot Stafford as he jumped off the balcony while trying to escape. 

Police said Kim then stood over Stafford and shot him again.

Residents said they heard arguing followed by several gunshots.

"I heard about eight or nine gunshots just go off, ‘Bow, bow, bow,’ like three separate times,” said resident Michael Issa. “It was like, first there was two or three, then there was a pause for like 30 or 40 seconds and then there was another three or four shots, and there was a pause, and a couple more shots

"I waited for like three or four minutes and I ain't hear nothing. I came outside to smoke a cigarette and look upstairs and there's feet hanging over my head," he added.

A friend of the victim said there had been several arguments over pets and noise.

One neighbor, Yoland Washington, spoke of the couple's children, including the infant who was home at the time of the shooting.

"When they come home today, their mother and their father is gone. Little baby, they call the newborn Little Mama, Little Mama is not going to never know her parents,” said Washington.

Child protection officer Marissa Gonzales said they had taken temporary custody of a one-month-old child found unharmed inside the apartment and that three other children who were at school at the time of the shooting are now with relatives.

Keaton Fox, Greg Janda and Stefan Gorman, NBC5, contributed to this report.

A former Navy SEAL who wrote "American Sniper," a best-selling book about his lethal career as a marksman in Iraq, was shot to death with another man at a gun range near Stephenville, Texas, on Saturday. 

Chris Kyle, 38, and the other man were found dead at the shooting range of Rough Creek Lodge on Saturday afternoon, Texas Highway Patrol spokesman Lonny Haschel told KXAS.

The gunman, identified as Eddie Ray Routh of Lancaster, Texas, was arrested after a brief pursuit, Trooper Haschel said. The other victim was named as Chad Littlefield, aged 35.

Routh, 25, was arraigned Saturday night on two counts of capital murder, said Haschel.

Officer Kyle Roberts at the Erath County Jail told the Associated Press that Routh arrived there Sunday morning and was being held on a combined $3 million bond. Roberts did not have information on whether Routh had a lawyer. 

Capt. Jason Upshaw of the Erath County Sheriff's Office said Routh used a semi-automatic handgun, which authorities later found at his home, the Associated Press reported.

Routh is in the Marine Corps Individual Ready Reserve, a U.S. military official confirmed. As such, he is not active or drilling with a unit.

Routh's service record shows that he was an armorer with the rank of corporal and served from June 2006 to January 2010. He was deployed three times -- to Iraq, various locations in Europe and the Middle East, and to Haiti.

Kyle, a Texas native who grew up hunting, served four tours in Iraq with Navy SEAL Team 3. His shooting during battles in Ramadi and Fallujah became legendary, and insurgents nicknamed him the "Devil of Ramadi" and put a bounty on his head.

He was credited with 160 confirmed kills, including one in 2008 in which he said he fired from 2,100 yards away -- 1.2 miles.

The Star-Telegram described him as "America's deadliest sniper."

AP/Erath County Sheriff's Office

This photo provided by the Erath County Sheriff's Office shows Eddie Ray Routh. He was charged with murder in connection with a shooting at a central Texas gun range that killed former Navy SEAL and "American Sniper" author Chris Kyle and  Chad Littlefield, the Texas Department of Public Safety said Sunday Feb. 3.

Haschel said Routh is believed to have shot the victims at around 3:30 p.m. local time (4:30 p.m. ET) before leaving the shooting range and returning to his home in Lancaster in a Ford pickup truck. Erath County Sheriff Tommy Bryant said the truck belonged to Kyle.

Kyle and Littlefield had taken Routh to the range, said Travis Cox, the director of a nonprofit Kyle helped found. Littlefield was Kyle's neighbor and "workout buddy," Cox told The Associated Press on Sunday morning.

"What I know is Chris and a gentleman — great guy, I knew him well, Chad Littlefield — took a veteran out shooting who was struggling with PTSD to try to assist him, try to help him, try to, you know, give him a helping hand, and he turned the gun on both of them, killing them," Cox told the AP.

Kyle's nonprofit, FITCO Cares, provides at-home fitness equipment for emotionally and physically wounded veterans.

Rough Creek Lodge is a resort and conference center about 90 miles southwest of Dallas and 24 miles southeast of Stephenville in the Texas Hill Country. Lancaster is just south of Dallas.

In a February 2012 interview with NBC News, Kyle said he didn’t want to put the number of kills in the book but the publisher insisted.

NBCDFW.com

Chris Kyle was credited with 160 kills during his time as a Navy SEAL marksman.

“If I could figure out the number of people I saved, that’s something I would brag about,” he told NBC News' Lester Holt. 

After leaving the Navy, Kyle founded Craft International, which provides training to military, police, corporate and civilian clients, Reuters said.

"It just comes as a shock and it's staggering to think that after all Chris has been through, that this is how he meets his end, because there are so many ways he could have been killed" in Iraq, Scott McEwen, who co-wrote "American Sniper," told Reuters.

Kyle appeared on the NBC reality TV show "Stars Earn Stripes" last year.

Kyle was married with two children.

NBC News' Courtney Kube, Jim Miklaszewski and Mark Stevenson contributed to this report.