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Aimee Kirst

Aimee Kirst was found dead of a gunshot wound to the head at her Pearl River home Friday morning after Mississippi authorities alerted the St. Tammany Parish Sheriff’s Office that the father of her 3-year-old son had admitted shooting her.

The Sheriff’s Office issued first-degree murder and second-degree kidnapping warrants for Jonathan Talley, 35. He is in custody in George County, Mississippi, and will have to be extradited to face charges in Louisiana, Sheriff’s Office spokesman Capt. Daniel Seuzeneau said.

The George County Sheriff’s Office contacted St. Tammany officials to say that Talley had arrived at his parents’ home in Mississippi early Friday morning with his young son. He told them he had shot his 33-year-old ex-girlfriend.

St. Tammany investigators learned there was an active restraining order against Talley for assaulting Kirst in early 2015, Seuzeneau said. Talley was arrested last year for allegedly threatening her and at one time had brought a firearm to a friend’s house where Kirst was staying, Seuzeneau said.

That incident prompted the protective order and resulted in Talley losing custody of their son, Seuzeneau said.

It’s not known what led to the fatal shooting, and investigators are trying to establish a motive.

The shooting is believed to have happened in the presence of the child, and investigators want to interview him to determine what he witnessed.

“This is truly a tragedy,” Sheriff Randy Smith said. “This young lady unnecessarily lost her life. What is even more tragic is that her 3-year-old son will now have to grow up without his mother and his father.”

The homicide, the second in St. Tammany Parish this year, occurred on the first day of Smith’s tenure as sheriff.

Seuzeneau, who formerly worked for Smith as public information officer for the Slidell Police Department, briefed the media after the swearing-in ceremony.

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Follow Sara Pagones on Twitter, @spagonesadvocat.