A 23-year-old man was rushed to the hospital late Saturday night after he was shot in the head in Linda Vista, the San Diego Police said.
Officers found the wounded victim lying on the ground near Atlas and Markham streets around 10:23 p.m.
Emergency crews treated him and took him to the hospital for life-threatening injuries.
Police have no information on a possible suspect.
Neighbors report hearing just one loud "pop" sound prior to seeing the victim on the ground.
The SDPD will continue the investigation.