The son of a Boston Red Sox broadcaster has pleaded guilty to murder in the stabbing of his girlfriend last year.

Jared Remy admitted Tuesday in Middlesex Superior Court that he fatally stabbed Jennifer Martel at the couple's Waltham apartment in August.

The judge didn't immediately accept Remy's guilty plea to charges of first-degree murder, assault and battery, and violating a restraining order. He faces a sentence of life in prison without parole.

Remy was arrested Aug. 13 after he allegedly pushed Martel into a mirror. He was released on his own recognizance and stabbed Martel on Aug. 15. He also pleaded guilty Tuesday to assaulting a man who tried to help Martel as Remy stabbed her.

The 35-year-old Remy and the 27-year-old Martel had a 5-year-old daughter. Remy is the son of Jerry Remy, a popular Red Sox announcer.

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