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 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, including a total of 15 criminal charges since 1998, according to Waltham court records. He has been accused of assaulting five people - including four women - and was involved in at least three restraining orders, including one in which he was the plaintiff.
Remy was ordered held without bail. His attorney did not immediately return a call for comment.
Martel's 4-year-old 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.
The Red Sox did not immediately return a call for comment, but NESN released a two-sentence statement lamenting the tragedy.
"All of us at NESN and the Red Sox, along with Jerry Remy, are filled with grief for everyone involved, and we extend our deepest sympathies to the family of Jennifer Martel," the statement read.
NESN said later in a separate statement that Dennis Eckersley will fill in for Jerry Remy for games through next weekend. Network spokesman Gary Roy did not respond to calls and an email for clarification.