FLORENCE — A 35-year-old woman found guilty last month of murdering her ex-boyfriend in Maricopa in December 2016 will spend the rest of her life in prison.

Kathryn Sinkevitch was convicted May 7 on a first-degree murder charge in the death of Michael Agerter. On Thursday morning, she was sentenced to life in prison without the possibility of parole by Pinal County Superior Court Judge Kevin White.

Agerter’s parents spoke to the court during the sentencing hearing. Sinkevitch made no comment.

In a statement to PinalCentral, Pinal County Attorney Kent Volkmer said he was glad to see justice for the victim.

“This is a unique situation where all of our law enforcement partners collaborated to hold the defendant fully accountable,” he said. “It’s my hope now that Michael’s family can begin the long process of healing from this tragic loss.”

Agerter was gunned down in his car after pulling into the garage of his Maricopa home. Surveillance videos captured his killer running up to the home and shooting him within a matter of seconds.

During the trial, the state presented evidence that Sinkevitch was found with two stolen license plates in her car. The prosecution said it showed she had been planning to commit a crime.

Sinkevitch also received an email the morning of the murder that informed her Agerter was scheduled to take a paternity test that afternoon. The state argued this let Sinkevitch know exactly when Agerter would arrive back at his home that day.

Sinkevitch and Agerter were in the middle of a custody dispute over their infant child at the time of the crime. Sinkevitch even hired a private investigator to obtain information on Agerter’s home address.

The victim was previously granted an order of protection in Maricopa County Superior Court against Sinkevitch in April 2016, just one month after their romantic relationship had ended.

After the jury reached a guilty verdict last month, the Pinal County Attorney’s Office said in a press release that Agerter had been actively involved in trying to establish paternity of Sinkevitch’s son, who was born in October. He believed he was the father.

“Agerter never saw his son before he was murdered, and the paternity results later confirmed he was the boy’s father,” the release stated.

Agerter’s family also made a statement after Sinkevitch was convicted.

“(Michael) took every legal precaution to protect himself and was trying to do the same for his child,” the family said. “Domestic violence knows no boundaries. Mike’s attempt to protect the child he never met escalated (Sinkevitch’s) aggression towards him, ultimately leading to his death.”


Brian Wright is the sports editor at PinalCentral. He can be reached at bwright@pinalcentral.com.