An ex-Nassau police officer pleaded guilty Monday to dozens of official misconduct charges related to his visits with mistresses while on duty, which prosecutors also said resulted in delayed 911 responses.

Michael Tedesco, 45, had faced more than 100 criminal counts, including felony charges of tampering with and falsifying records, after allegations he spent up to six hours a shift at the homes of two women instead of doing his job.

Prosecutors said he pleaded guilty to 75 misdemeanor counts of official misconduct. He'll have to forfeit about $195,000 in termination pay, do 100 hours of community service and pay $3,700 in restitution.

Nassau District Attorney Kathleen Rice said in a prepared statement that the outcome was a win for taxpayers "who paid thousands of dollars in wages to a police officer who failed to serve the public he swore to protect."

Prosecutors also dismissed 29 felony charges against Tedesco, according to his attorney, Bruce Barket of Garden City.

"It was a very fair, a very decent resolution of the charges he was facing," Barket said.

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He said it wasn't likely that Tedesco would have kept his termination pay because he resigned while facing internal police department charges.

The married father of two abruptly resigned from his job as an officer at the Seaford-based Seventh Precinct in April 2012 as internal affairs investigators probed allegations that he visited a mistress while on duty.

Authorities said that probe started after a neighbor of one woman reported seeing Tedesco's cruiser regularly in the woman's driveway for hours at a time.

Prosecutors had alleged Tedesco, a Nassau police officer for 18 years, spent hundreds of hours between June 2010 and February 2011 at two women's houses while he was on duty.

The district attorney's office said after Monday's sentencing that the conviction included charges that Tedesco lied about his work activity to cover up dozens of on-duty hours spent at their residences, both of which were "a significant distance" from his patrol sector.

They said Tedesco lingered at his mistresses' houses instead of leaving for calls that included alarms, domestic disturbances and a report of a possible cardiac arrest.

Prosecutors also said that Tedesco didn't update his availability for calls through his police computer, sometimes even falsifying data to make it look like he was answering a call while he remained at a woman's house.

If convicted, Tedesco would have faced up to 7 years in prison on the charges in a 2012 indictment. His salary was $182,748 in 2011.

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Authorities said that by the law, Tedesco will get his pension, an amount not available last night. He had lived in Holbrook, but his attorney said he has since moved away.

Acting Police Commissioner Thomas Krumpter praised investigators for the probes that led to Tedesco's conviction.

"The department will not tolerate any breach of the public trust," Krumpter said in a prepared statement.

Tara Obenauer, a woman who had identified herself as one of Tedesco's mistresses, could not be reached Monday. She had filed a claim saying she planned to sue Nassau for $10 million for failing to supervise Tedesco.

An attorney who has represented her said Obenauer is no longer a client.

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A county spokesman said there was no settlement.