No cause of death was revealed in the press release, but Peter Mayhew's family told ABC News he suffered a heart attack. It's also worth noting that Mayhew had undergone a spinal surgery to improve his mobility, and he had been recovering from that procedure. There will be a memorial service held for family and friends on June 29, and a memorial will be set up at Empire Con LA this December for fans to check out that Mayhew’s family will attend, as well as feature some of the actor’s “personal effects” and “collection.”