The son of longtime Boston Red Sox broadcaster Jerry Remy pleaded not guilty to a charge that he fatally stabbed his girlfriend.

The son of longtime Boston Red Sox broadcaster Jerry Remy pleaded not guilty Friday to fatally stabbing his girlfriend a day after he was released from custody for allegedly assaulting her.

Jared Remy was arraigned in Waltham District Court on charges of murder and domestic assault and battery in the Thursday night killing of Jennifer Martel, 27.

Police officers responding to several 911 calls went to a Waltham apartment complex at about 10 p.m. Thursday and found Martel on an outside patio with multiple stab wounds, Middlesex District Attorney Marian Ryan said.

In court, prosecutors described a brutal and determined attack, saying Remy assaulted Martel in the kitchen, living room, on a stairway and then pinned her to the ground in the patio where he stabbed her several times. Neighbors who tried to help Martel were driven back when Remy slashed at them, Middlesex Assistant District Attorney Lisa McGovern told a judge.

Remy, 34, was arrested at the scene, his clothes soaked in the victim's blood.

On Wednesday, Remy had been released on personal recognizance 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.

Remy has a violent criminal history.