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SAN DIEGO — A San Diego police sergeant accused of stalking his ex-girlfriend was arrested Wednesday, the department said.

Investigators arrested Sgt. Mariusz Czas Thursday morning following a seven-month criminal investigation, the department said in a news release.

After a woman told local law enforcement that her ex-boyfriend was harassing her, SDPD detectives met with the woman to look into the allegations. The department immediately relieved Czas of his duties and reassigned him so that he would have no contact with the public.

A criminal complaint filed this week charges the 18-year member of the department with three felony counts — stalking, extortion and false imprisonment by violence, menace fraud, deceit — and five misdemeanors — two counts of making harassing phone calls and one count each of false imprisonment, disobeying a court order and destroying or concealing documentary evidence.

The complaint alleges the conduct occurred between April and July of last year.

Czas was booked into San Diego Central Jail late Wednesday morning. A District Attorney’s Office spokeswoman said late Wednesday that Czas posted $100,000 bail, and his arraignment is scheduled for June 22.

Investigators conducted numerous interviews, met with the San Diego County District Attorney’s Office multiple times and executed a search warrant at Czas’ home, police said.