Julian McMahon, who died at age 56 on Wednesday after a private battle with cancer, starred as the half-demon Cole Turner on the drama, which ran from 1998 to 2006. The show followed three sisters, Piper Halliwell (Holly Marie Combs), Prue Halliwell (Shannen Doherty), and Phoebe Halliwell (Alyssa Milano), who discover they are witches.