FARMINGTON — Farmington police said Sharolyn Keown, 18, was shot and killed in Farmington on Monday night.

Police arrested Jacob Beach, 19, late Tuesday night and charged him with an open-count of murder for Keown's death, Farmington police Lt. Taft Tracy said in a news release.

Police responded to a report of gun shots at 11 p.m. Monday at Hummingbird Trailer Park. Keown was found shot outside and paramedics determined she was dead, Tracy said.

Police alleged that Keown and Beach were arguing in an undeveloped lot north of the mobile home complex because of an unwanted sexual advance Beach made weeks earlier.

During the argument, Keown slapped Beach and then he allegedly brandished a gun and started shooting, Tracy said.

Keown was shot in the chest.

Tracy said Beach fled the scene after the shooting. Friends and family of Beach and Keown directed police to the Enchantment Hotel in Aztec where Beach was arrested Tuesday night.

He is being held on a $500,000 cash-only bond, police said.

Keown was the fourth homicide and the second fatal shooting Farmington police have responded to this year, he said.

Keown was from Farmington and most recently went to school at Farmington High School, said Laurel Keown, the victim's grandmother.

Laurel Keown said Sharolyn's mother, also of Farmington, was unavailable to talk on Tuesday.

Sharolyn has siblings and a father who live in Arizona.

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The family was from the area.

“My granddaughter was shot and killed,” Laurel said. “No. We are not good.”

Laurel Keown said her granddaughter lived with a man in Farmington.

“We don't know what happened,” she said. “We're waiting to see what happens.”

Police continued to ask for the public's help on Tuesday night.

Police said witnesses reported that Beach started disassembling his firearm after the shooting and the parts were discarded as he made his escape. Anyone who has found gun parts is asked to call Farmington police detectives at 505-599-1005.