SAN DIEGO (CNS) - Authorities released the name Monday of a 64-year-old man who collapsed and died over the weekend during a hike to the summit of Cowles Mountain.

Witnesses reported seeing Andrew Lewis of San Diego fall to the ground while ascending a trail toward the 1,593-foot peak in Mission Trails Regional Park about 7:30 a.m. Sunday, according to the county Medical Examiner's Office.

Bystanders performed CPR on Lewis until personnel aboard a rescue helicopter lowered a crew member down to their location, fire department spokesman Lee Swanson said. The paramedic took over the lifesaving efforts, which proved futile. Lewis was pronounced dead at the scene.

A cause-of-death ruling was on hold pending completion of postmortem exams.