The teenager turned himself in to detectives Tuesday evening after he was identified as a suspect during the investigation, according to Santa Monica police.
Officers responded at about 12:30 a.m. Monday to Parking Lot 1 North, 1550 Pacific Coast Highway, following a report of a possible shooting. When officers arrived, they found a man suffering from multiple gunshot wounds. He was pronounced dead at the scene.
"The preliminary investigation indicates that a physical altercation occurred between two groups prior to the shooting," police said in a statement.
Police are not releasing the suspect's name because he is a minor.
An investigation is ongoing.