LOS ANGELES (CBSLA.com) — Authorities Sunday released video surveillance of a 21-year-old school custodian who was fatally shot while sitting in his car at a traffic light.

Jarret Crump and a 25-year-old female friend were stopped at around 5:40 p.m. Monday at Century Boulevard and Vermont Avenue, where they were attacked by an unknown gunman.

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The shooting took place just two blocks from where Crump had lived with his grandmother, his mother Dara Davis-Oliver said. She said the gunman got out of a dark-colored SUV, ran around to the driver’s side of the vehicle and shot her son.

Davis-Oliver said her son “went to work every day” as a custodian for the L.A. Unified School District and was not a gang member.

“His circle of friends are good, not like gang bangers, none of that. I taught him to be a man of valor and he was a man of valor,” his mother said.

Crump’s female passenger suffered injuries that were not considered life-threatening, according to LAPD Detective Rick Gordon.

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Police are seeking the gunman and a second suspect in connection with the shooting, Gordon said.

While Crump was not a gang member, detectives with the LAPD’s Criminal Gang Homicide Division told CBS2’s Art Barron that they are hoping the release of the video surveillance will generate leads.

Family members suspect the shooting was a case of mistaken identity, perhaps over Crump’s car.

The man’s mother told Barron she would not rest until her son’s killer is brought to justice.

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