TUCSON, Ariz. (AP) — A former University of Arizona graduate student convicted of fatally shooting a hydrology professor on campus months after he was expelled could be facing a life prison term when he’s sentenced Monday.

A Pima County Superior Court jury last month found Murad Dervish guilty of first-degree murder in the death of Thomas Meixner, who was shot 11 times near his office on Oct. 5, 2022.

Dervish, 48, also was convicted on five other felony counts, including aggravated assault for a bullet that grazed a building manager.

Jurors deliberated for less than three hours on May 21 before reaching their verdicts against Dervish.

Prosecutors have said Dervish should get life in prison without parole.

Dervish’s attorney said his client was in the midst of a psychotic episode at the time of the shooting and urged jurors to consider a lesser charge of second-degree murder that could have meant confinement in a psychiatric hospital, rather than a prison cell.

But prosecutors said evidence showed Dervish planned Meixner’s killing and bought a 9 mm handgun a month before using it in the shooting.

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Meixner, 52, headed the university’s Department of Hydrology and Atmospheric Sciences. Dervish was in the master’s degree program in atmospheric sciences.

Authorities said Dervish was banned from the school in January 2022 and later expelled for ongoing issues with professors after he received a bad grade.

According to a criminal complaint, a flyer with a photograph of Dervish was then circulated to university staff in February 2022 with instructions to call 911 if Dervish ever entered the John W. Harshbarger Building, where Meixner worked.

The complaint also said Dervish was barred from school property and was the subject of several reports of harassment and threats to staff members working at Harshbarger.

Witnesses testified that Dervish was wearing a surgical mask and baseball cap as a disguise when he showed up outside Meixner’s office and shot the professor.

Dervish fled the scene but was arrested three hours later after Arizona state troopers stopped his car on a highway more than 120 miles (190 kilometers) northwest of Tucson.

Authorities said a loaded handgun was found in the vehicle, and the ammunition was consistent with the shell casings found at the shooting scene.