A hiker collapsed Sunday while climbing Cowles mountain.
Despite the San Diego Fire Department attempting an open space rescue the man was pronounced dead at the scene.
SDFD responded to an emergency call at around 7:30 a.m. and performed CPR on a fallen hiker while a rescue helicopter was en route.
The helicopter lowered a medic down onto the scene where resuscitation efforts continued, but were ultimately unsuccessful.
The hiker was identified Monday as Andrew Seth Lewis, 64, of San Diego.
The cause of death is still unknown.