Santa Margarita coach Harry Welch has cancer Posted on September 9, 2010 by Fred Robledo Santa Margarita football coach Harry Welch has prostate cancer and will undergo surgery for it during the upcoming football season. Welch, 65, said his doctor, after initial exams, suggested a biopsy was needed and the biopsy revealed the cancer. A meeting with a specialist Tuesday will inform Welch of more details on the surgery and post-surgery treatment.