BOSTON (CBS) — A staff member at a Jamaica Plain high school has been fired for allegedly trying to kill a teenager, authorities say.

Shaun Harrison, 55, was charged with armed assault with intent to murder in connection with the Tuesday night shooting of a 17-year-old male in Roxbury, according to Suffolk County District Attorney Daniel Conley’s office.

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Authorities alleged that Harrison ran a marijuana distribution business and had enlisted the victim to work for him until a dispute arose between them.

On Tuesday night, authorities say the two left Harrison’s home on Pompeii Street and were walking on Magazine Street when Harrison pulled out a handgun and pointed it at the back of the victim’s head and fired.

Surveillance video from a nearby business captured the incident.

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Police said the teenage victim was taken to a hospital and treated for non-life threatening injuries. Harrison was arrested Wednesday.

A LinkedIn page for “Rev. Shaun Harrison” identified him as dean of students at English High School.

A Boston Public Schools spokeswoman said Harrison was the “Dean of Academy” there, where he functioned as a family outreach coordinator.

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WBZ NewsRadio 1030’s Bernice Corpuz reports