04/21/2004 at 12:00 AM EDT
"Happy Days" actress Roz Kelly, 58, who played Pinky Tuscadero, admitted in a Los Angeles courtroom on Friday that she violated probation when, on Aug. 20, she hit her ex-boyfriend over the head with a cane, reports the Associated Press. She faces up to two years in prison for the act, say prosecutors. Last year, Kelly was sentenced to three years probation (after pleading no contest to charges of firing a shotgun at two cars and into a home) and ordered to undergo psychiatric counseling. Her attorneys claim that she suffers from a bipolar disorder.