NORTH COAST, Calif. — Napa County District Attorney Allison Haley on Thursday announced the filing of murder charges against a Napa man who authorities said killed a woman pregnant with twins.

Haley is charging Ernie Victor Solis, age 40, of Napa, in connection with the murders of Hailey Privett, age 33, who was reported to be his fiancee, over the weekend.

The twins she was pregnant with at the time of her death are reported to have been fathered by Solis.

Solis is charged with three counts of murder and faces the special allegation of multiple murder — the unlawful killing of more than one person that can result in life imprisonment without the possibility of parole or the death penalty, depending on the circumstances.

Solis also faces allegations that the crimes are serious and violent felonies; involved the use of a deadly weapon; great bodily injury; violence, cruelty, viciousness or callousness; the use of a weapon; vulnerable victims; violent conduct; that he was in a position of trust; that the crimes increase in seriousness from past crimes; that he had a prior prison term, a prior strike, and prior poor performance on probation or parole.

It is alleged that Solis murdered Privett and her unborn babies at her Dale Drive home in Napa, on the morning of June 8.

A team led by the Napa Police Department and consisting of the Napa County District Attorney’s Office, Napa County Sheriff’s Office, and Napa County Special Investigations Bureau collaborated on the investigation, which led to the defendant’s arrest.

Officials said no further information regarding this case will be released at this time, as Napa County Deputy District Attorney Michelle Roberts prepares the People’s case against Solis. The defendant is held without bail at the Napa County Department of Corrections and is next scheduled to appear in court at 8:30 a.m., June 17, in Department 1 of the Napa County Superior Court for a hearing in which he is expected to enter a plea and to set a future preliminary hearing.