Dustin Diamond has been convicted of two misdemeanour charges after a bar fight last Christmas left a man stabbed. The actor, who played the lovable Screech in 'Saved by the Bell', was found guilty of carrying a concealed weapon and disorderly conduct, but cleared of recklessly endangering public safety by a jury in Wisconsin.

Dustin Diamond outside the Celebrity Big Brother houseDustin Diamond outside the 'Celebrity Big Brother' house in 2013

The incident happened on Christmas Day in Port Washington, while the 38-year-old actor was with his partner Amanda Schutz, 27. Diamond said a group in the bar wanted to pose for photos and shake his hand, but that others were badgering him and Schutz, forcing him to step in and defend his fiancee by brandishing a pocketknife to deter the group.

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Witnesses told the court the problem began when Schutz pushed a woman at the bar and grabbed another woman's hand. Diamond said he had not meant to stab anyone during the altercation, but he could face up to nine months behind bars for carrying a concealed weapon, while the disorderly conduct charge carries a maximum sentence of 90 days in prison.

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Schutz was also convicted of disorderly conduct and faces up to 90 days in prison, reports the BBC.

Diamond, a former 'Celebrity Big Brother' housemate, told police he may have struck a man with a pen, and the man did not suffer any serious injuries. Both Diamond and Schutz are due to be sentenced on June 25.