Mark Smythe , a New Zealand-born and L.A.-based composer, died Saturday after a medical emergency on the Mount Wilson hiking trail near Los Angeles. He was 53. The L.A. Coroner’s office reported that the cause of death was cardiovascular disease. The rescue team said in a statement, “Sierra Madre Search and Rescue extends our condolences to the family and friends of the deceased man. We also extend our thanks to the man’s friends and other hikers who assisted today.” Smythe was nominated for an SCL Award and a World Soundtrack Award for his score for Hulu’s “The Reef: Stalked” in 2023.…