A renowned composer who died while hiking on a notorious Southern California mountain trail suffered a cardiac emergency. Mark Smythe, a 53-year-old New Zealand-born musician, passed away Saturday while climbing Mount Wilson near Sierra Madre , according to the Los Angeles County Medical Examiner. The coroner’s online database listed Smythe’s cause of death as atherosclerotic cardiovascular disease, a condition in which plaque builds up in the arteries and can lead to heart attacks. Mark Smythe, a 53-year-old New Zealand-born musician, passed away Saturday while climbing Mount Wilson near Sierra Madre. Facebook/@kate.wardsmythe Friends and family members reportedly performed CPR on Smythe before rescuers arrived, but he was pronounced dead at the scene. Sierra Madre Search and Rescue Team Emergency crews responded May 9 after reports of a hiker found unresponsive just north of Rescue Ridge on the Mount Wilson Trail, according to the Sierra Madre Search and Rescue Team.…