Kevin Hart has a reputation as one of comedy’s bad boys — but he’s an angel compared to his wild-man dad, who’s had multiple drug busts, was found guilty of sexual assault — and was even accused of stabbing a man in the head after stealing $6 from him, RadarOnline.com has learned exclusively!<br /><br />A bombshell Radar investigation reveals Kevin’s dirty dad, Henry Witherspoon, has a rap sheet that spans three decades of violence, felonies and prison stints in Kevin’s hometown of Philadelphia.<br /><br />Court records obtained by Radar reveal Witherspoon and two accomplices cowardly robbed a lone 16-year-old at gunpoint in 1969, ten years before 38-year-old Kevin was born.<br /><br />SEE BOMBSHELL COURT DOCS HERE<br /><br />A year later, Witherspoon was arrested for running a craps game — but he was just getting started.<br /><br />The year Kevin was born, 1979, he was found guilty of rape and simple assault!<br /><br />In 1987, cops actually saw him viciously attack a guy with martial arts nunchaku sticks after he’d already robbed him of $270. His victim got ten stitches — and Witherspoon got three years of probation after pleading guilty to aggravated assault.<br /><br />So it was probably a good thing that Witherspoon, a cocaine addict, was almost never home after Kevin turned eight. He worked as a refrigeration mechanic and lived in a Philadelphia room with his girlfriend, leaving his wife, Nancy Hart, to raise the future comedy superstar and his older brother, Robert, on her own. Tragically, Nancy died of cancer in 2007.<br /><br />He was arrested on DUI charges in 2013 — and just last September he became embroiled in an extortion plot involving a steamy sex video with a Las Vegas model. The FBI is investigating the case!<br /><br />Kevin publicly apologized to his wife, Eniko Parrish — who was pregnant at the time — and his children Heaven, 12, and Hendrix, 10, who he had with ex-wife Torrei Hart. It was “a bad error in judgment,” Kevin confessed.<br /><br />We pay for juicy info! Do you have a story for RadarOnline.com? Email us at tips@radaronline.com, or call us at (866) ON-RADAR (667-2327) any time, day or night.