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Gregg played the role of the BTK (Blind, Torture, Kill) Killer, Dennis Rader, in the 2005 made-for-television movie, "The Hunt For The BTK Killer."
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Gregg has performed annually with the Rockworks Riff to benefit Hurricane Katrina victims since 2005.
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Gregg appeared in the 1987 tv-movie "Bates Motel," a failed spin-off of the Psycho (1960) film series.
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Gregg has appeared in 5 of director Brian DePalma's films, including:
Scarface (1983)
Body Double (1984)
Raising Cain (1992)
Femme Fatale (2002)
The Black Dahlia (2006)
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Gregg's songs have appeared on the soundtracks to the films Banter (1986) and Purgatory Flats (2002).
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Gregg is married to the American Theater Director Lisa James.
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Gregg specializes in playing villains and shady characters.
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Gregg is 5 feet 11 inches tall.
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Gregg has his own band and has played with fellow actor Bruce Greenwood, producing 3 albums together.
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Gregg starred in the TV movie The Great Pretender (originally titled Dead End Brattington) in 2000 that was intended as a pilot for a series that was never picked up.
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Gregg has appeared twice in the Star Trek franchise playing alien characters, as Gallatin in Star Trek: Insurrection (1998) and on the Enterprise episode "Dawn" as Zho'Kaan. He also lent his voice to the Star Trek: Hidden Evil computer game in 1999.
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Gregg starred with Melanie Griffith and Craig Wasson in Body Double (1984) as the film's villain.