Earl Boen, a prolific voice and character actor best known for his performance as the villainous Dr. Peter Silberman in The Terminator films, has reportedly died at age 81.

Per TMZ and Variety, the actor died in Hawaii on Thursday. Although an official cause of death remains unclear, a friend of Boen and his family told Variety that he was diagnosed with stage 4 lung cancer this past fall.

While he’s widely recognized as the infamous criminal psychologist from 1984’s Terminator — a role he reprised in 1991’s Terminator 2: Judgment Day, 2003’s Terminator 3: Rise of the Machines, and via archival footage in 2019’s Terminator: Dark Fate — Boen appeared in over 250 different films, television series, radio programs, and video games throughout his decades-long career in entertainment.