WALTHAM, Mass. — The son of longtime Boston Red Sox broadcaster Jerry Remy was arrested on a murder charge in the fatal stabbing of his girlfriend, hours after he was released from custody in an assault case against her.

Jared Remy was scheduled to be arraigned Friday in the death of Jennifer Martel, 27, at a Waltham apartment complex Thursday night, Middlesex District Attorney Marian Ryan said.

Remy was released on personal recognizance Wednesday in an open assault and battery case in which Martel was the alleged victim, Ryan said. The there was no active restraining order against him, she said.

Police went to the Windsor Village apartment just west of Boston just before 10 p.m. Thursday in response to multiple 911 calls, Ryan said, and found Martel in an outside patio area with multiple stab wounds.

Jared Remy was arrested at the scene. It’s unclear if he has an attorney.

He suffered an unspecified injury that wasn’t self-inflicted, authorities said. He was taken to a hospital and released to await arraignment, officials said.

Martel’s child in the apartment was unhurt and is now in the custody of state child welfare officials. It was unclear if Remy was the father, Ryan said.

Jerry Remy is a former Red Sox second baseman who has been a color analyst on team broadcasts on the New England Sports Network since 1988. He has struggled with health problems in recent years.

Jared Remy is a former Red Sox security staffer who was fired by the team in 2008 during a steroid investigation.

Calls to NESN and the Red Sox were not immediately returned.