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Michael Agerter, a Maricopa, Arizona native, was killed inside his own car in 2016. The happy-go-lucky man, who was well-liked among his peers and acquaintances, was fighting a bitter custody battle and recovering from a bad breakup when police received a call from Michael's sister, Marlie, who claimed to have heard three gunshots while on a call with him.
The case was the subject of Investigation Discovery's The Murder Tapes. Titled Three Loud Booms, the episode, that previously aired on July 6, 2022, is all set for a rerun on November 22, 2022, at 7 PM EST. The synopsis for the episode reads:
"In what looks like a planned ambush, a young man turns up dead in his garage in Maricopa, Ariz.; police must look into a romance gone wrong to find his killer, and the child that the two may share."
Michael Agerter's brutal murder case is filled with tricky details that will likely astonish devout true crime fans. Investigations revealed that there was much more to the crime than what initially met the eye.
Five quick facts about Michael Agerter's murder
1) Michael Agerter was fighting a custody battle with his ex-girlfriend Kathryn Sinkevitch
The custody battle between Michael and his ex-girlfriend was perhaps the most crucial piece of the puzzle in the case. Michael and Kathryn allegedly split up shortly before he was killed. During this time, the victim was engaged in a legal battle with Kathryn over their infant son, who was born right after they split.
Michael was fighting for visitation rights as well as intended to codify his parental rights as well.
2) Upon reaching the scene, police found that the victim had succumbed to gunshot wounds
The police were alerted by Michael's cousin, who claimed to have heard "three loud booms" while on a phone call with Michael. As the police rushed to the scene, they found the garage door open, noting that a car was running.
Soon enough, they discovered a severely wounded Michael in his vehicle, who had gunshot wounds on his head. The victim, who was shot inside his car, had succumbed to his wounds by then.
3) Eight months before his murder, Michael moved away to Maricopa, enraging Sinkevitch
What might have possibly enraged Sinekvitch was that Michael Agerter moved away to Maricopa about eight months before his murder. He also allegedly took their dog, Darwin, with him. In response, Sinkevitch even hired a private investigator and found out where he lived. She later went ahead and stole the dog back.
4) Sinkevitch used her coworker's van to create a fake alibi
Upon further inspection, authorities found that Kathryn Sinkevitch had used her co-worker's van and keycard to create a fake alibi for herself. The co-worker also allegedly confirmed her version of the story. Security video from the building where Sinkevitch worked showed the co-worker's van leaving the lot at 12.30 pm on the day of the murder and returning at about 3.30 PM. Michael was murdered during this time.
Though it seemed that Sinkevitch never left the office, she had actually used her co-worker's keycard to get in and out of the workplace, effectively creating a fake alibi.
5) Michael Agerter was indeed the father of the child
After Kathryn was arrested, it was revealed that Michael was indeed the father of Kathryn's child. Kathryn was sent to prison for life with no possibility of parole and remains incarcerated at the ASPC Perryville Lumley Unit in Goodyear, Arizona.
