Unspeakable is a 2000 exploitation film written and directed by Chad Ferrin and starring Roger Garcia, Tina Birchfield, and Timothy Muskatell.
On his way home from a party, James Fhelleps is involved a car crash that kills his daughter Heather, and leaves his wife Alice disfigured, paralyzed and catatonic.
After murdering a perverted priest, James is held at gunpoint by Slick, a minion of "street king" Hell, but wounds his assailant, having one of his ears shot off in the struggle.
James disfigures Barry (who narrowly escapes, only to commit suicide in his own home out of fear of prison) and leaves, rigging the place so that it explodes when Slick breaks in, killing him and Alice.
[1] A two and a half out of five was awarded by Dread Central, which criticized the pace and uninteresting subplots, but wrote, "It's a commendable first effort though, limitations considered, and most certainly does the job of delivering an angry wallop straight to the gut".