Los Angeles County Supervisor Don Knabe recommended the reward Monday, and the board agreed, in the hope that witnesses to the slaying of Lashown Fils will come forward.
Fils was gunned down on Jan. 11, in the 200 block of West 14th Street at about 3:55 a.m.
Officers arrived to find a critically injured Fils down on the street. Long Beach Fire Department paramedics rushed him to a local hospital, where he died a few hours later, police said.
Homicide investigators do not believe Fils was a gang member, and the motive for the shooting remains unknown, said Nancy Pratt, a Long Beach Police Department spokeswoman.
Homicide Detective Mark Bigel said Fils, who used to live in the neighborhood, may have been in the area to visit someone he knew and was confronted by the suspect or suspects, then shot. Fils mother, Lajuana Fowler, said she didn't know why her son would return to the area after he was jumped and seriously injured near the park not that long ago.
Fils leaves behind his parents, siblings and a son, who was only 8-months-old at the time of the slaying.
Anyone with information is urged to call Long Beach Police Homicide Detectives Terri Hubert and Mark Bigel at 562-570-7244. Anonymous tips can be made at 1-800-222-TIPS (8477), texting TIPLA (84752) plus