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Ben Margot, Associated Press
Newly named Interim San Francisco Sheriff Vicki Hennessy speaks beside Mayor Ed Lee during a news conference Tuesday, March 20, 2012, in San Francisco. Lee announced the appointment after Sheriff Ross Mirkarimi refused to step down over a domestic violence case. A judge on Monday sentenced Mirkarimi to three years of probation and a year of counseling after the sheriff pleaded guilty to misdemeanor false imprisonment.

SAN FRANCISCO — San Francisco's mayor has charged Sheriff Ross Mirkarimi with official misconduct stemming from his guilty plea in a domestic violence case involving his Venezuelan actress wife.

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Mayor Ed Lee filed the charge Wednesday afternoon, a day after he announced that he would place Mirkarimi on suspension.

Lee said the sheriff's guilty plea to a misdemeanor false imprisonment charge fell "below the standards of decency and good faith."

A New Year's Eve dispute between the sheriff and his wife, Eliana Lopez, in front of their toddler son left her with a bruise on her arm.

Lee had given Mirkarimi the option of resigning or facing the misconduct probe. A defiant Mirkarimi refused to step down, saying his actions did not constitute official misconduct.