Boston, MA – A now-former high school dean was convicted May 31 of shooting a student whom he had recruited to sell marijuana.

Shaun Harrison, 58, who was known as an anti-violence advocate, was found guilty of armed assault with intent to murder, according to the New York Post.

“Shaun Harrison was really a fraud, he was living a lie, and it was clearly exposed in this case,” District Attorney Dan Conley said, according to the New York Post. “Not only was he not a man of God or a role model for young people, he manipulated them in a way that was terribly offensive.”

Harrison was a dean at Boston English High School for five years. He recruited then 17-year-old Luis Rodriguez to sell marijuana for him at the school.

Harrison shot Rodriguez on March 3, 2015 because he thought the student wasn’t selling enough pot and withholding some of the money, the New York Post reported.

Rodriguez, who is now 20, testified that his family was dysfunctional and that he trusted Harrison, who the students had given the nickname “Rev.”

USA Today reports that Harrison bragged to students about his gang ties, drugs and guns.

In court, Rodriguez said that Harrison was his counselor and he went to him for everything.

Harrison and Rodriguez had agreed to meet at a gas station on the day of the shooting. Rodriguez was supposed to hand over some drugs to Harrison.

Harrison shot Rodriguez in the back of the head and fled on foot, according to prosecutors. The bullet entered Rodriguez just under high right ear. It just missed his carotid artery, according to the New York Post. The bullet broke his jawbone and caused nerve damage and hearing loss.

People in a passing car called 911 and saved Rodriguez.

According to Bruce Carroll, Harrison’s attorney, Rodriguez originally told staff at the hospital that he was shot in a drug deal gone bad by one of his customers.

“It took me a while to get all my thoughts back together after being shot in the head, sir,” Rodriguez said during the trial, according to the New York Post. “I was in such denial. I knew who did it. Of course I knew who did it.”

USA Today reported that Harrison was sentenced to up to 26 years in prison.