An Arizona pizza topper will spend the rest of his life behind bars for killing a co-worker he thought he was falling in love with.
Tyler Ross McGuire He will never walk free again, after the 31-year-old pizzeria manager received his mandatory life sentence earlier this month for the premeditated 2023 ambush killing of an alleged romantic rival. Deazo Seghi.
Court documents delivered to Us Weekly claim Seghi, 22, worked at Rounder’s Pizza in Mesa, where McGuire was the manager.
The two men also worked with a woman, whose name has not been released. His age was also not provided.
Prosecutors had argued in court documents that McGuire had “fixated” the employee and even became an HR nightmare when he “told the woman he was in love with her.” Prosecutors claimed that “she made it clear” to her boss “that she was not interested.”
Later that month, “McGuire physically confronted the victim, believing he was also in a relationship with the woman.”
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Prosecutors said McGuire spent the next year becoming increasingly angry with Seghi and eventually “purchased a gun and looked up the victim’s address.”
On December 11, 2023, Seghi was found dead inside his vehicle, parked in front of the apartment complex where he lived. “According to witnesses, McGuire approached the vehicle and shot the victim multiple times in the chest” and neck “before fleeing.” according to a statement from the prosecutor’s office.
Court documents confirm witnesses told police they saw a man in a dark-colored hoodie shoot at the vehicle before arriving and taking something from the car. It was unclear what, if anything, had been taken from the vehicle.
At the time of his arrest, McGuire had a cell phone and a black handgun that he used to commit the revenge killing. The bullets inside the gun matched the bullet casings found outside Seghi’s car. He demanded of a lawyer as the handcuffs clicked on his wrists.
“Days after his arrest, the defendant’s mother contacted the police about a newspaper belonging to the defendant,” a statement from the prosecutor’s office said. “The journal entries detailed the defendant’s plan to kill the victim and his reasoning for doing so. One journal entry read: “I decided some time ago that I had to kill someone. This person hurt me.’ Another entry read: ‘If I wanted to, I would be with her.’ Even though I was robbed of that opportunity.”
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It was unclear why McGuire believed his workers were romantically involved, and authorities have never said whether they were able to determine whether Seghi and the worker ever had a workplace romance.
“This defendant carried out a planned and unprovoked murder, leaving a family with unimaginable loss,” the county attorney said. Rachel Mitchell said in a statement about the case. “This sentence delivers justice for the victim and affirms that this level of violence will be met with the strongest consequences under the law.”
The sentence was handed down earlier this month, after a jury found McGuire guilty of one count of first-degree murder in the November 2025 death of Seghi.