Garry Shandling’s doctor refuses to sign death certificate, coroner’s office to investigate cause of death

Garry Shandling’s doctor is reportedly mystified as to why the beloved standup died — and his refusal to sign the death certificate has spurred the coroner’s office to investigate.

Shandling’s physician has “repeatedly refused” to sign the document because he believed the “Larry Sanders Show” creator — whom he hadn’t examined in more than a year — to be in fine physical condition, TMZ reported Saturday

As a result, the Los Angeles County Coroner’s Office has subpoenaed the comedian’s medical records and collected blood work from the emergency room at St. John’s Health Center in Santa Monica, where Shandling was pronounced dead Thursday morning.