Courtesy of the Crowley family

Missing 15-year-old Pierce Crowley.

A teenager from Westchester County, N.Y., has been missing since last Friday and was "in a fragile state" when he was last seen, his concerned parents said.

Police say Pierce Crowley, 15, of Rye, N.Y., left New York-Presbyterian Hospital in White Plains, N.Y. with a close friend before he went missing.

In an email to friends, his parents wrote that their son was “in a fragile state” and hadn't been feeling well when he disappeared. "It is URGENT that we locate him ASAP," they wrote, according to the New York's Hudson Valley Journal News.

It's not clear what Crowley was in the hospital for. The White Plains medical center is one of the top psychiatric hospitals in the nation.

According to police, Crowley's friend came forward to say the two left the hospital and went to The Cheesecake Factory restaurant together, Newsday reported.

The two then took a cab to the White Plains Metro-North train station, the report said. Crowley's friend took a train to New York City while Crowley stayed behind in the cab.

According to White Plains police, Crowley was last seen wearing a bright blue Florida Gators short sleeve T-shirt with dark blue jeans and black sneakers with lime green-trim. The teen is enrolled at Iona Prep in New Rochelle.

Crowley has light brown hair, blue eyes, and wears braces, The Journal News said. He is 5'10'' and 150 pounds.

Hundreds of volunteers have mobilized to help the Crowleys find their son, a family friend told media. Fliers were posted in Westchester, Manhattan and the Bronx, and the family set up a Facebook page. 

“We love Pierce. We miss Pierce,” his father, Peter Crowley, said, according to Newsday. “His brothers miss Pierce. We need him home.”

Crowley family friend Peggy Dunne told The Journal News, “(Pierce) is a charming, talented, bright student and an amazing athlete. His family and his friends are just totally distraught about him missing.”

There is a reward for information that leads to his safe return, the family said. White Plains police have asked anyone with tips to contact them.

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A grand jury has declined to bring charges against White Plains police in the shooting of a 68-year-old former Marine at his apartment last year.

The grand jury's decision was announced Thursday by the Westchester County district attorney.

On Nov. 19, 2011, police were dispatched to the Winbrook Houses public housing project to aid Kenneth Chamberlain, a chronically ill heart patient.

Read the original report at NBCNewYork.com

Chamberlain apparently had accidentally triggered his medical alert pendant, and when the responding officers banged on his door, he told them he was OK and refused to let them in.

But then Chamberlain and the police became engaged in an hour-long standoff, and the officers eventually forced open the door, fearing someone else inside was in danger, according to police.

The man's family contends that police then used a Taser on Chamberlain for no reason, then shot him with a bean bag gun before firing two fatal shots.

“My father was murdered by the same people that were supposed to come and help him,” Kenneth Chamberlain Jr. said last month.

Police have said the elder Chamberlain had a knife.

The medical alert company’s voice box in the room captured the conversation, which has not been released to the public.

There is also abbreviated video of Chamberlain captured by the camera on the officer's stun gun.

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Mayor Bartlett, the attorney representing the Chamberlain family, alleged the police officers used racial slurs and taunted the elderly man.

There was no immediate comment from the family. The White Plains police union said the officer's actions were "necessary and justified" and said it was grateful for the grand jury's investigation.

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