Mario Humberto Bernal was 19 when he was shot and killed in an alley on Imperial Avenue in San Diego on August 5, 2012. The San Diego Police Department investigated but no suspects were identified and the motive remains unclear; the case later went cold.

Investigators cited hesitant witnesses and a lack of substantial physical evidence as major obstacles. Bernal’s death has been described as part of a pattern of unresolved homicides in the area that continue to challenge local law enforcement.

Anyone with information about Mario’s death or who may have been in the Imperial Avenue area on August 5, 2012, is asked to contact the San Diego Police Department.