|Bloody Pit of Horror (Il Boia scarlatto; The Crimson Executioner; A Tale of Torture; Virgins for the Hangman) (1965) [Travis Anderson]: Poisoned when he's knocked against the poisoned spikes on the "Lover of Death" effigy in his dungeon, at the end of a fight with Walter Brandi.
Delirium (Delirio caldo; Death at the Villa) (1972) [Herbert Lyutak]: Fatally beaten with a mace by Christa Barrymore; he dies shortly afterwards while crawling towards the entrance of the tunnel. (In the US cut of the film, a new opening and closing sequence were added; the epilogue of this version reveals that Mickey was actually killed in combat in Vietnam, and that the entire story has been his dying dream.) (Thanks to Bloodtys)
The Reincarnation of Isabel (Riti, magie nere e segrete orge nel trecento; The Ghastly Orgies of Count Dracula; Rites, Black Magic and Secret Orgies in the Fourteenth Century) (1973) [Jack Nelson]: Crumbles into dust when Rita Calderoni rejects him during the black magic ritual. (The movie was very difficult to follow, so I'm unsure as to exactly what happened; I'm also unsure whether Mickey's 20th-century character was a reincarnation of his 14th-century character who was burned at the stake, or whether he was immortal.)