The boyfriend of an 18-year-old pregnant woman fatally shot in St. Paul earlier this month admitted to police he pulled the trigger, but said it was an accident, authorities say.

Luis Isaac Chacon-Villeda called 911 after his girlfriend, Eileen Viveros-Vargas, was shot in the head inside a bedroom at his parents’ house on March 9, according to one of several search warrants filed in Ramsey County District Court related to the case.

“Who shot her,” Chacon-Villeda was asked during the emergency call, according to one of the search warrants. “Me,” the 19-year-old responded.

Chacon-Villeda was arrested at the scene on suspicion of murder and later released from custody after the Ramsey County Attorney’s Office charged him with fifth-degree drug possession. He has not been charged in connection with Viveros-Vargas’ death, which remains under investigation.

Officers responded to the scene at 5:45 p.m. They located the couple in an upstairs bedroom in the residence on the 1900 block of East Cottage Avenue. They found Chacon-Villeda attempting to render aid to his girlfriend, the search warrant said.

Three other people also were reportedly in the house at the time.

A black and silver .22 semi-automatic handgun was on a shelf near the bedroom door. A law enforcement officer who investigated the scene said he observed the gun without a magazine, noting that the weapon “appeared to have malfunctioned,” according to a search warrant.

When interviewed about what happened back at police headquarters, authorities say Chacon-Villeda initially told them Viveros-Vargas shot herself while he was across the room.

He later admitting that he had shot his pregnant girlfriend, but said it was accidental, according to a search warrant.

Preliminary autopsy results indicate Viveros-Vargas death was a homicide.

Investigators say they have learned that she and Chacon-Villeda had a “volatile relationship” and may have had previous domestic incidents.

Police filed a search warrant to analyze the couple’s cell phones to help “prove or disprove Chacon-Villeda’s story to police,” one search warrant said.

An officer who responded to the scene noted a strong smell of marijuana inside the bedroom where Viveros-Vargas was shot, according to authorities, and also discovered a glass jar containing what appeared to be marijuana as well as digital scales and plastic baggies with smaller amounts of the green, leafy substance.

Chacon-Villeda told investigators the drugs were his and that he sold marijuana in the neighborhood, authorities say.

His confession prompted the Ramsey County Attorney’s Office to charge with him fifth-degree drug possession. He was released from custody after he posted bail March 13.

The attorney representing him on that case, F. Clayton Tyler, declined to comment on the allegations made in the search warrants related to Viveros-Vargas’ death.

“I haven’t heard any of the tape-recorded statements yet so I don’t know what is accurate and what’s not accurate at this point,” he said. “I will withhold my comments until I see all the discovery.”

The 19-year-old has no criminal record.

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Viveros-Vargas’ relatives could not be reached for comment on the search warrants.

Viveros-Vargas and Chacon-Villeda had been together about two years, according to a family member. She said her cousin, who planned to study cosmetology, was about five or six months pregnant when she died.