Ernesto Melendez was struck while getting into his car at the valet stop in front of Vibe Caf? at Ventura Boulevard west of Kester Avenue on Aug. 18.
The 22-year-old Pierce College student was taken to the hospital, where he later died. There's now a $50,000 reward on the table.
"My brother, only 22 years old, lost his life and the person who did this didn't even bother to stop. I just want closure," said the victim's sister, Patricia Lazalde.
Melendez's mother was also killed by a motorist who hit her, but that driver did not leave the scene.
"Seven years ago I lost my mom and the only person I had was my brother," said Lazalde.
Police believe the driver was in a gray newer model Hyundai Tucson.
Anyone with information was asked to contact the Los Angeles Police Department at (877) LAPD-24-7.