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| - Dennis Keiffer is an American actor, kickboxer and stuntman. He portrayed a Grimlock in the season 1 episode "Out of Sight", as well as the Killer in Alley in the season 6 episode "Crimes and Witch-Demeanors".
- Dennis Keiffer es un actor quien interpretó a Baraka en Mortal Kombat: Aniquilación.
- Dennis Keiffer is an actor who portrays Izzy in FX's Sons of Anarchy.
- Dennis Keiffer is an actor who portrayed Bullethead in The X-Files television series.
- Dennis Keiffer is an American kickboxing champion, stuntman and actor. On House, M.D., he portrayed MMA fighter Danny in the Season 5 episode Not Cancer. Despite his impressive stunt credits, he also has an extensive acting resume with featured roles in Shootfighter Fight to the Death, Mortal Kombat Annihalation, Longshot The Movie, The Dead Girl, Death Sentence, Bitch Slap, Sons of Anarchy, The Green Hornet and Project: SERA.
- Dennis Keiffer is a stunt performer and actor who appeared twice in Season 5 of 24:
* In Day 5: 10:00am-11:00am, he played one of Anton Beresch's separatists who was waiting for CTU to attack Ontario Airport, but he was shot by the TAC team. He was seemingly doubling for Derek Selander's character.
* In Day 5: 12:00am-1:00am, he played one of Christopher Henderson's mercenaries at Van Nuys Airfield, who shot and killed Doug Masters. He seemed to be killed twice by Jack Bauer during the scene.
- Keiffer, a former K.I.C.K. Super Middleweight Kickboxing Champion, started his film career as a background performer and fighter in movies such as the action films Shootfighter: Fight to the Death (1992, with Chris Torres), Bloodfist IV: Die Trying (1992, with Gene LeBell), Maximum Force (1992), Dragon Power (1993), Full Contact (1993), Firepower (1993), Bloodfist V: Human Target (1994), Guardian Angel (1994, with Marshall R. Teague), and Fists of Iron (1995, with Matthias Hues).
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