Authorities have ordered toxicology tests in the death of Rodney King, but the results won’t be known for several weeks, a sheriff’s spokeswoman told msnbc.com on Monday.

King, the black motorist whose videotaped beating by Los Angeles police officers in 1991 sparked some of the deadliest race riots in U.S. history, was found dead on Sunday. He was 47.

Police in Rialto, Calif., found King's body in a swimming pool after his fiancee called 911, Rialto Police Capt. Randy DeAnda told NBC News. He was transported to Arrowhead Hospital in Colton, where he was pronounced dead at 6:11 a.m. PDT, DeAnda said.

An autopsy was scheduled for Monday, but results won’t be

 released today, San Bernardino County Sheriff's spokeswoman Jodi Miller said. Authorities said there were no signs of foul play.

Rodney King: 20 years after L.A. riots, 'Can we all get along?'

King was beaten by Los Angeles Police Department officers on a dark street on March 3, 1991, after he was stopped for speeding. Four officers hit him more than 50 times, kicked him and shot him with stun guns. A bystander videotaped much of the incident from a distance.

A year later, a California jury acquitted three of the four officers. The jury deadlocked on one of the charges for the fourth officer, Laurence Powell. Three of the officers were white and one Hispanic.

The riots that erupted on April 29, 1992, were among the most lethal in U.S. history. By the time order was restored, more than 50 people had died, nearly 3,000 were injured and thousands of businesses were damaged or destroyed.

20 years later: Have race relations improved?

In the two decades after he became the central figure in the riots, King was arrested several times, mostly for alcohol-related crimes. He later became a record company executive and a reality TV star, appearing on shows such as "Celebrity Rehab."

Looking back on that time, King told NBCLosAngeles.com in April, “Some of me wanted to get out there and riot and loot and tear up stuff too, but it just wasn’t the way I was raised.”

When he ventured into the streets during the riots, he wore a reggae hat with dreadlocks so people wouldn’t recognize him.

“It just looked a little bit like the war zone to me, smoke everywhere,” he told the station. “It broke my heart to look at that and to know this is, it’s really all about racial tension, and it’s a man-made problem.”

When King sat down with NBCLosAngeles.com, he was promoting his just-published memoir, "The Riot Within: My Journey From Rebellion to Redemption," which came out around the 20th anniversary of the L.A. riots. According to the biography that accompanied his book, King had three children and was engaged to marry Cynthia Kelley, a juror in the civil suit he brought against the city of Los Angeles.

Nearly a year after the riots, a federal jury convicted two of the police officers of a federal charge of violating King’s civil rights and sentenced them to 30 months in prison. Two other officers were acquitted. King eventually received a $3.8 million settlement from the city, and the case led to sweeping changes in LAPD.

King said he was no longer bitter about what had happened.

“I like to be able to wake up and be able to pray for myself and pray for the world, that’s the most important thing,” he told NBCLosAngeles.com.

The Associated Press and Reuters contributed to this report.

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Updated at 3:34 p.m. ET: Rodney King, the black motorist whose videotaped beating by Los Angeles police officers in 1991 sparked some of the deadliest race riots in U.S. history, was found dead Sunday, police said. He was 47.

Police in Rialto, Calif., found King's body in a swimming pool after getting a 911 call from his fiancee, Rialto Police Capt. Randy DeAnda told NBC News. Officers pulled King from the pool and began doing CPR, but he was unresponsive.

King was transported to Arrowhead Hospital in Colton, where he was pronounced dead at 6:11 a.m. PDT, DeAnda said.

The San Bernardino County coroner will perform an autopsy.

"Right now we have no reason to believe there was foul play because of the circumstances," Rialto Police Sgt. Richard Royce told msnbc.com. "The evidence is that it was a simple drowning."

Rodney King: 20 years after L.A. riots, 'Can we all get along?'

Homicide detectives continued to investigate mid-Sunday morning, Royce said, although he called the investigation "a standard death investigation."

Kevork Djansezian / Getty Images

Detective Carla McCullough, right, of Rialto police directs a police photographer as they investigate the death of Rodney King, who was found in his pool on Sunday.

A file photo from the Los Angeles Times shows that the pool is oval and that King had erected tarps around it to prevent neighbors from peering in. Two dates are inscribed along the pool wall: 3/3/91, the day King was beaten, and 4/29/92, the day a jury acquitted three of the four officers who beat him.

King was beaten by Los Angeles Police Department officers on a dark street on March 3, 1991, after he was stopped for speeding. Four officers hit him more than 50 times, kicked him and shot him with stun guns. A bystander videotaped much of the incident from a distance.

A year later, a California jury acquitted three of the four officers, three of whom were white and one Hispanic. The jury deadlocked on one of the charges for Officer Laurence Powell.

The riots that erupted on April 29, 1992, were among the most lethal in U.S. history. By the time order was restored, more than 50 people had died, nearly 3,000 were injured and thousands of businesses were damaged or destroyed.

In one of the most searing images from the riots, a 33-year-old white construction worker named Reginald Denny was pulled from his vehicle and beaten unconscious by four men at a Los Angeles intersection. Twenty years later, he has still not recovered from his injuries.

The violent reaction prompted King's famous plea on television: "Can we all get along?"

Gene Blevins / Reuters

A former bodyguard for Rodney King, Johnnie Kelly, left, walks with one of King's daughters Dene King, center, outside her father's home in Rialto, a suburb of east Los Angeles, on Sunday.

Nearly a year later, a federal jury convicted two of the police officers of a federal charge of violating King’s civil rights and sentenced them to 30 months in prison. Two other officers were acquitted. King eventually received a $3.8 million settlement from the city, and the case led to sweeping changes in the LAPD.

The police chief, Daryl Gates, came under intense criticism from city officials who said officers were slow to respond to the riots. He was forced to retire. Gates died of cancer in 2010.

20 years later: Have race relations improved?

In the two decades after he became the central figure in the riots, King was arrested several times, mostly for alcohol-related crimes. He later became a record company executive and a reality TV star, appearing on shows such as "Celebrity Rehab."

In an interview earlier this year with The Associated Press, King said he was a happy man.

"America's been good to me after I paid the price and stayed alive through it all," he said. "This part of my life is the easy part now."

King had recently been promoting his just-published memoir, "The Riot Within: My Journey From Rebellion to Redemption." The book came out around the 20th anniversary of the L.A. riots.

King, who has three children, was engaged to marry Cynthia Kelley, a juror in the civil suit he brought against the city of Los Angeles, according to the biography that accompanied his book.

The Los Angeles Times published a quote that King gave the newspaper earlier this year: "I would change a few things, but not that much. Yes, I would go through that night, yes I would. I said once that I wouldn't, but that's not true. It changed things. It made the world a better place.''

Slideshow: Los Angeles riots: 20 years later

Hyungwon Kang / Reuters

Revisiting a turbulent chapter in race relations

Launch slideshow

Reuters and The Associated Press contributed to this report.

Twenty years ago this weekend, riots broke out in Los Angeles – and spread to other cities – after a California jury acquitted three white and one Hispanic Los Angeles police officers in the videotaped beating of black motorist Rodney King.

The riots that erupted on April 29, 1992, were among the most lethal in U.S. history. By the time order was restored, 53 people had died, nearly 3,000 people were injured and thousands of businesses were damaged or destroyed.

In one of the most searing images beamed into living rooms across the country from the disturbance, a mostly black mob enraged by the acquittal dragged white truck driver Reginald Denny from his cab at a south Los Angeles intersection and beat him unconscious while news helicopters hovered overhead.

Nearly a year later, a federal jury convicted two of the police officers of a federal charge of violating King’s civil rights and sentenced them to 30 months in prison. Two other officers were acquitted. King eventually received a $3.8 million settlement from the city, and the case led to sweeping changes in LAPD.

More recently, King has been promoting his just-published memoir, "The Riot Within: My Journey From Rebellion to Redemption."

AP Photo/George Holliday/Courtesy of KTLA Los Angeles

The beating of Rodney King by a group of Los Angeles police officers was captured on videotape by a citizen.

As Los Angeles, and the nation, reflects on the anniversary this weekend, many are asking the same plaintive question King uttered on the steps of city hall during the riots two decades ago: "Can we all get along?"

Many seem to agree that the city is safer today and relations between ethnic groups have improved. A recent poll of Los Angeles residents by the Center for the Study of Los Angeles at Loyola Marymount University found that most say L.A. is unlikely to see a repeat of such riots in the coming years.

NBCLosAngeles.com has a special package of stories and videos about the 20th anniversary of the riots here.

Do you think race relations have improved? Take the poll below and then join the discussion on Facebook.

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