Actor who played Will “Doc” Hayward on the original ABC series was also the father of co-creator, Mark Frost Warren Frost, best known for his role as Dr. Will Hayward in ‘Twin Peaks,’ died on Friday, Feb. 17 following a lengthy illness. He was 91. Warren Frost, best known for his role as Dr. Will Hayward in ‘Twin Peaks,’ died on Friday, Feb. 17 following a lengthy illness.