A Long Island lawmaker who admitted revealing portions of an internal investigation about police failures in a domestic-violence case that led to a woman’s death was found in contempt of court and fined $2,500 yesterday.

US District Court Judge Arthur Spatt said Peter Schmitt, presiding officer of the Nassau County Legislature, violated a confidentiality order in a February TV interview. Schmitt didn’t immediately comment.

Schmitt and the Legislature had just voted in February to approve a $7.7 million settlement in a federal civil-rights lawsuit filed by the family of Jo’Anna Bird when he spoke to a reporter from News12 Long Island.

In the interview, Schmitt said: “There are 22 police officers in this county who were mentioned in that confidential internal-affairs report who ought to be ashamed to look at themselves in the mirror every morning when they get up to shave, much less be wearing the badge.”