Dustin Diamond, best known for playing Screech on the 1990s TV series "Saved by the Bell," has been charged with stabbing a man at a Wisconsin bar on Christmas.

The 37-year-old actor faces charges of felony second-degree recklessly endangering safety, disorderly conduct and carrying a concealed weapon.

According to the criminal complaint, Diamond told police that he and his fiancee went out to several bars Thursday night in Port Washington, about 30 miles north of Milwaukee. The couple, who lives in Port Washington, got into a tussle with two men and another woman at the Grand Avenue Saloon, the complaint said.

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Port Washington police say they responded at 11:15 p.m. Thursday to a report of a stabbing at a bar. When police caught up with their SUV down the road from the bar, Diamond told police he had a "pen" in his hand when he grabbed one of the men, according to the complaint.

Port Washington police found in the car a switchblade, the point of which was covered in what appeared to be blood. Diamond later told police he accidentally stabbed the man while trying to defend his fiancee, according to the complaint.

The man had been stabbed under the armpit and police said he was not seriously injured.

He appeared Friday afternoon in Ozaukee County court, where bail was set at $10,000. His fiancee, 27-year-old Amanda Schutz, also faces a disorderly conduct charge.

Diamond's agent declined comment Friday. No attorney was listed in court records.

Milwaukee's WDJT reports that Diamond is due back in court on Dec. 29.

Since his decade-long run at Bayside High, Diamond has been sued several times for delinquent taxes and in foreclosure proceedings for missing mortgage payments. He has appeared on reality TV shows, made a sex tape and most recently produced a tell-all documentary on Lifetime TV called "The Unauthorized Saved by the Bell Story."