BOULDER, Colo. — A mentally ill man who killed 10 people at a Colorado supermarket was convicted Monday of murder by a jury that rejected his attempt to avoid prison time by pleading not guilty by reason of insanity.

Tyler Quirion, 20, pleaded not guilty Monday in connection with the killing of Justin Iraola on Feb. 19 in Waterville.

A jury has found a man guilty of shooting and killing 10 people at a grocery store in Boulder, Colorado, in March 2021. In addition to the 10 first-degree murder counts, Ahmad Alissa was found guilty of a slew of other crimes, including 38 counts of attempted murder.

The jury trial hinged not on whether Ahmad Al Alissa opened fire but whether the mentally ill man understood the difference between right and wrong.

A man who killed 10 people at a Colorado supermarket has been found guilty of murder in the 2021 attack, becoming the latest person to fail in an attempt to be acquitted by reason of insanity. Jurors found Ahmad Alissa guilty on Monday,

Ahmad Al Aliwi Alissa, who killed 10 people in the mass shooting in 2021, had argued that he was not guilty by reason of insanity.

Ahmad Alissa was convicted on charges that included 10 counts of first-degree murder and 38 counts of attempted murder.