A man charged with repeatedly stabbing his pregnant US Army veteran girlfriend and killing her unborn daughter has told police it was an accident.

Oscar Alvarez, 30, made his initial court appearance on Tuesday evening and was charged with attempted murder, assault with intent to cause serious physical injury, assault and weapons possession in connection to the frenzied knife attack on 30-year-old Liv Abreu.

Alvarez is accused of stabbing his girlfriend, who was 26 weeks into her pregnancy, a half-dozen times in the chest and once in the side inside their apartment on Walton Avenue in The Bronx early Tuesday morning.

Boyfriend charged: Oscar Alvarez (left), 30, is pictured in court on Tuesday. He is accused of stabbing his pregnant girlfriend, Liv Abreu (right), and killing her unborn baby

Excited mom: In February, an overjoyed Abreu shared this sonogram image showing her baby girl at 17 weeks of gestation. She was due in August

Alvarez's Legal Aid lawyer told the court his client has no prior criminal history and is a hardworking man

It was previously reported that the expectant mother sustained 30 wounds.

Despite her injuries, Abreu, who served in Afghanistan as a paratrooper with the 82nd Airborne Division, managed to crawl downstairs to a neighbor's unit and call for help.

Abreu is currently listed in critical but stable condition at Lincoln Hospital. Her unborn baby girl, who was due in August, could not be saved.

Abreu's older brother, Juan Carlos Abreu, tells New York Daily News his sister is expected to make a full recovery.

'The physical wounds will heal,' Juan Carlos said. 'The mental wounds will also heal at some point, but it will probably take longer. She's positive. My sister, she's a warrior.'

Police said Alvarez and Abreu got into a heated argument at around 12.30am concerning the boyfriend's suspicions that his girlfriend was cheating on him.

According to investigators, Alvarez grabbed a knife and repeatedly stabbed Abreu in the torso, then denied her care for 30 minutes until he put on a clean Polo shirt and jeans, grabbed the victim's cellphone and keys, and walked out of the apartment, leaving the woman bleeding.

The New York Daily News reported that Alvarez fled the scene in Abreu's 2004 Jeep Cherokee SUV, which he ditched a block away. He turned himself in to police at 4am.

During his initial interview with police, the boyfriend that the attack that killed Abreu's baby was an accident. Alvarez then stopped talking and asked for an attorney.

During his first court appearance, Alvarez's Legal Aid lawyer Joshua Hadas told a judge his client is a hardworking man who has no criminal history.

The judge ordered Alvarez held without bail.

Abreu served as a paratrooper and human resources specialist based at Fort Brag, North Carolina. She earned a degree in political science in 2012 from the City University of New York and served as a spokesperson for the Iraq and Afghanistan Veterans of America.

Alvarez initially fled, but turned himself in three hours later and told police the stabbing was an 'accident'

Grisly scene: Abreu suffered at least seven wounds inside her apartment on Walton Avenue during a fight with her boyfriend

Abreu was a former paratrooper in the US Army. Both she and her boyfriend worked at a T-Mobile store in Manhattan (pictured in a company shirt, right)

Both she and her boyfriend worked at a T-Mobile store in Manhattan, where she was a retail manager.

A neighbor said Abreu was excited about her pregnancy, and a super in her building told NBC4 the mom-to-be had only recently said how she wished her mother, who died last year, had lived to meet her baby.

The young couple had lived in the building near Yankee Stadium for about a year, and a few neighbors told ABC 7 NY they saw no signs of domestic violence, but others said Alvarez and Abreu would often argue and scream at one another.