Warren Birbeck confessed to investigators he stabbed a 42-year-old woman to death early Wednesday because he suspected her of cheating, according to deputies.

This is his third murder: in 1963, Birkbeck was convicted of manslaughter in Massachusetts. He also was convicted in 1999 of second-degree murder in New Hampshire.

Denise Cook died at a home in the area of Trask and Society drives at the hands of 71-year-old Birkbeck, who told authorities he killed her, according to the Pasco County Sheriff's Office.

The sheriff’s office initially responded to an aggravated battery call around 3:15 a.m.

Birkbeck went into the room of the woman and stabbed her multiple times, deputies say. The suspect, victim and another 85-year-old woman shared the home.

The probable cause affidavit states Birkbeck was upset with Cook because he overheard her on the phone talking with a male. She knew he was in love with her, Birkbeck said, but she did not express the same feelings toward him, reads the affidavit.

"When asked why the defendant killed the victim he stated, 'I just have a hard time being rejected,'" the affidavit says.

The investigation is ongoing.

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