9mm or 40-caliber? Prosecutors questioned witness over handgun in murder case.


A man who briefly dated murder suspect Kathryn Sinkevitch took the witness stand in the first-degree murder trial as it entered its fourth day Monday.

Sinkevitch is accused in the shooting death of 31-year-old Michael Agerter on Dec. 16, 2016. Agerter, her ex-boyfriend, was shot and killed in the garage of his rental home in Rancho El Dorado. The two lived separately but had an infant son together.

Nathan Trotter, of Surprise, said he met Sinkevitch on Plenty of Fish, an Internet dating website and application. After knowing each other online for about a week, in early November 2016 they met in person at a bowling alley. He said she had her infant child with her.

“We saw each other a few times after that,” he said.

They were just getting to know each other and were intimate, he told the jury. The relationship lasted until mid-December.

“It kind of fizzled out,” he said.

Trotter said Sinkevitch talked about the “father of her child” and said they were going through a custody battle. He said it affected his willingness to see her again after a while.

“It was a lot more drama than I was willing to get involved with,” he said.

They also talked about guns one day at her house. He said guns are “a hobby of his.” Trotter is also ex-military and was in the U.S. Army infantry.

The day he went to her house, he saw a pistol sitting on the living room coffee table when he entered her home. He picked it up and “cleared it” to make sure it was safe.

There was a round in the chamber and more bullets were in the magazine, he testified.

He said it was a “gray-colored, lower-end” handgun. He said it he believed it was a 9mm handgun, and he carries a 40-caliber handgun. When questioned by prosecutors, he said it could have been a 40-caliber gun.

Prosecutors have not located the murder weapon in this murder case, but it was determined to be a 40-caliber handgun.


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