SOUTH LOS ANGELES (CBSLA.com) — Police offered a $50,000 reward for information leading to the arrest of the person who shot and killed a teenager with special needs in South Los Angeles on Tuesday.

Patrick Caruthers, 19, was gunned down while he was sitting at a picnic table around 3:15 p.m. at the Jackie Tatum/Harvard Recreation Center in the 1500 block of West 62^nd Street.

He was shot multiple times in the back by an unidentified suspect, according to homicide detectives.

The suspect sped away in a dark sedan.

Police said Caruthers was shot for no reason.

Dozens of residents gathered for a vigil Wednesday to honor the long-time park volunteer.

Gail Sears, Caruthers’ mother, is still in shock at the loss of her eldest son.

“He loved who he was. He felt good about himself. And the one thing about this community… is everyone accepted Patrick for Patrick,” she said.