PACIFIC PALISADES, CA – Authorities Monday identified a hiker who collapsed and died in the Santa Monica Mountains in Pacific Palisades.

James Duncan, 52, of Porter Ranch, was pronounced dead about 4:30 p.m. Sunday after he collapsed on a remote trail off East Topanga Fire Road near Topanga State Park, according to the coroner's office and the Los Angeles Fire Department.

An autopsy was pending to determine the cause of Duncan's death, which may have been due to a heart attack, the coroner's office reported.