Watch: Sean "Diddy" Combs, Justin Timberlake & More: Stars Arrested in 2024Content warning: This story discusses allegations of domestic violence and threats of suicide. Jack Nicholson's 29-year-old grandson is in trouble with the law. Sean Knight Nicholson (also known as Sean Norfleet) was arrested on Aug. 5 after allegedly attacking his ex-girlfriend Elizabeth Lawlor, according to Los Angeles County Sheriff's Department booking records viewed by E! News.