A Las Vegas woman has been arrested for gunning down her boyfriend as she modeled for him with a weapon during an impromptu photoshoot — and after cops discovered her disturbing “fascination with firearms.”

Officers responded to a 911 call that a male had been shot at a home about 3 miles south of the North Las Vegas Airport, a little before 5 a.m., on Aug. 23, according to the Las Vegas Metropolitan Police Department .

Authorities discovered Mark Gaughan sprawled on the sidewalk with a gunshot wound to his neck. He was pronounced dead at the scene despite desperate life-saving efforts by first responders. 3

Gaughan, 23, had been taking photos of his girlfriend, Allysandra Blea, when he was killed, police said.

Police said that during the early morning photoshoot, Blea, 20, was

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