Prosecutors have filed a first-degree murder charge against a young woman from Dublin accused of stabbing her boyfriend and beating him with a hammer during a fight in her apartment earlier this month.

Dublin Police Services identified the victim publicly last week as 23-year-old Jesus Silva Gallegos, who was reportedly staying on and off in the apartment of girlfriend Crystal Angelina Espinoza.

Espinoza, 23, remains in custody at Santa Rita Jail in Dublin with a no-bail hold following her arrest in the early-morning hours of May 6 after an overnight police investigation, according to authorities.

She had an initial court appearance on May 10, one day after the Alameda County District Attorney's Office filed a criminal complaint against her for Gallegos' death. It is unclear whether she is represented by an attorney yet.

The situation unfolded around 9 p.m. May 5, when police and paramedics were dispatched to the 5421 at Dublin Station apartment complex on Campbell Lane, in the mixed-use neighborhood north of the Dublin-Pleasanton BART Station.

First responders were told that a boyfriend and girlfriend had been fighting and the man was possibly suffering from cardiac arrest, according to a probable cause declaration written by Dublin police Officer Shane Kaufman.

Emergency personnel arrived at Espinoza's third-floor apartment to her greeting them at the front door and escorting them to her boyfriend, who was unconscious in the bathroom, according to Kaufman.

While working to save his life, paramedics observed bruising, multiple lacerations and stab wounds on Gallegos' body, according to Kaufman. The 23-year-old man was pronounced dead at the scene.

As the investigation carried on, officers noticed a large kitchen knife with apparent dried blood on the blade in plain view on the kitchen counter and later saw a hammer on a bedroom dresser with dried blood too, according to Kaufman.

"During contact with officers on scene, Espinoza made statements that implicated her in the victim's death. During an interview, Espinoza invoked her right to an attorney," the officer wrote.

Espinoza was placed under arrest at Dublin Police Services headquarters around 2:30 a.m. May 6 and booked into the county jail in Dublin four hours later, according to authorities.

Prosecutors formally charged Espinoza on May 9 with first-degree murder and special allegations of committing great bodily injury, violent conduct and use of a weapon. She is scheduled to return to court in Dublin for further arraignment proceedings on May 24, according to the sheriff's inmate locator page.

The deadly altercation occurred three days after Espinoza's 23rd birthday, according to the probable cause declaration.