Costas Mandylor is an Australian actor. He was born Costas Theodosopoulos in Melbourne, Victoria, Australia, the son of Louise (née Mandylaris) and Yannis Theodosopoulos, a taxi driver.
Originally remembered for the role of Kenny, a deputy sheriff, in Picket Fences, Mandylor is currently best known for portraying Hondshew in Beowulf and Lieutenant Mark Hoffman/Billy the Puppet in Saw parts III, IV, V and soon to be VI. He and his actor brother, Louis Mandylor, shared the screen together as homicidal ghost siblings in the fourth season episode "Saving Private Leo" of Charmed, where he was reunited with former Picket Fences co-star, Holly Marie Combs.
Mandylor is also an avid soccer fan and plays occasionally with Hollywood United F.C., a team composed mostly of celebrities and former professionals.