Actor Julian McMahon has died at 56 after a private battle with cancer. Former co-stars, including Alyssa Milano and Ioan Gruffudd shared heartfelt tributes.

McMahon was known for portraying villain Doctor Doom in 2005’s Fantastic Four and 2007’s sequel, Fantastic Four: Rise of the Silver Surfer. He also played Christian Troy in Ryan Murphy’s Nip/Tuck and Cole Turner in Charmed. His more recent credits were in The Residence and The Surfer.

Rose McGowan, who starred with McMahon on The WB’s Charmed, shared a statement on her Instagram Story. “Oh Julian you force of brilliance, wild talent and humour. For you, your family and loving fans all over the world, I pray comfort.”