Dylan Walsh is remembering his “Nip/Tuck” co-star. After Julian McMahon died on Wednesday at the age of 56 following a private battle with cancer, the “Unforgettable” alum, 61, shared a touching message for the late actor.

Julian McMahon 's cause of death has been revealed. According to a Cremation Approval Summary Report from the Pinellas County Medical Examiner's Office in Florida obtained by PEOPLE, the Australian actor, best known for roles on Nip/Tuck and Charmed, died from lung metastasis as a result of head and neck metastatic cancer.

Holly Marie Combs, Rose McGowan, Michael Chiklis, Dylan Walsh, and Joely Richardson also shared their memories following the actor's death at 56.Actors from Charmed, Fantastic Four, and Nip/Tuck are paying tribute to Julian McMahon.