Mesa Man Sentenced to Natural Life for Coworker's Murder

31-year-old Tyler McGuire convicted of first-degree murder for killing 22-year-old Deazo Seghi over workplace dispute

Jan. 27, 2026 at 6:55pm

Got story updates? Submit your updates here. ›

A 31-year-old Mesa man, Tyler McGuire, has been sentenced to natural life in prison for murdering his coworker, 22-year-old Deazo Seghi, in 2023. Authorities say the murder stemmed from tensions between the two men over a woman they both worked with, with McGuire becoming fixated on the woman despite her lack of interest.

Why it matters

This case highlights the serious consequences for acts of workplace violence and the need for employers to have strong policies in place to address and de-escalate tensions between employees. It also raises questions about mental health support and intervention for individuals who exhibit concerning behavior.

The details

According to prosecutors, tensions between McGuire and Seghi began in December 2022 when McGuire confronted Seghi and accused him of pursuing a woman they both worked with at a Mesa pizza shop. McGuire had become fixated on the woman, even after she told him she wasn't interested. Over the following year, McGuire's anger toward Seghi intensified, and he eventually purchased a gun and searched for Seghi's home address. McGuire later shot and killed Seghi while the victim was sitting in his vehicle outside an apartment complex in Mesa.

  • In December 2022, tensions between McGuire and Seghi began.
  • Over the following year, McGuire's anger toward Seghi intensified.
  • McGuire eventually purchased a gun and searched for Seghi's home address.
  • McGuire shot and killed Seghi in 2023.

The players

Tyler McGuire

A 31-year-old Mesa man who worked as a supervisor at a pizza shop with the victim, Deazo Seghi. McGuire was convicted of first-degree murder for killing Seghi.

Deazo Seghi

A 22-year-old man who worked at the same pizza shop as McGuire. Seghi was shot and killed by McGuire in 2023.

Rachel Mitchell

The Maricopa County Attorney who stated that the sentence 'delivers justice for the victim and affirms that this level of violence will be met with the strongest consequences under the law.'

Got photos? Submit your photos here. ›

What they’re saying

“This sentence delivers justice for the victim and affirms that this level of violence will be met with the strongest consequences under the law.”

— Rachel Mitchell, Maricopa County Attorney (ktar.com)

What’s next

The judge's decision to sentence McGuire to natural life in prison affirms the severity of his crime and the commitment to public safety in the Mesa community.

The takeaway

This tragic case underscores the importance of workplace policies and mental health support to address concerning behavior before it escalates to violence. Employers must remain vigilant in fostering a safe and respectful work environment for all.