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A California teacher who unintentionally discharged a handgun during a class on gun safety has resigned.

Dennis Alexander, who teaches at Seaside High School in Monterey and moonlights as a reserve police officer in a neighboring town, submitted his resignation March 29 effective at the end of the school year, Marci McFadden, a spokeswoman for the Monterey Peninsula Unified School District said in an email to local news organizations on Tuesday.

He remains on administrative leave, she added.

Alexander fired his Glock handgun toward the ceiling of the classroom on March 13, officials said. It still isn’t clear how that happened or what precisely Alexander was attempting to demonstrate about gun safety in his class on the administration of justice.

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One student received minor injuries from debris dislodged by the bullet.

Alexander is trained in weapons handling and safety as a part-time reserve officer for the Sand City Police Department. The Glock 21 .45-caliber semiautomatic handgun was issued by that department, though the county superintendent said he was not authorized to bring it to school.

Alexander, who is also a Seaside City Council member, apologized at a council meeting after the event. He still faces possible prosecution in connection with the incident, which attracted national attention because it came shortly after the Feb. 14 mass killings at Marjory Stoneman Douglas High School in Parkland, Florida, and at a time when the subject of arming teachers was being hotly debated.

Alexander, who is apparently popular among many students at the school, reportedly had brought his weapon to class on previous occasions, allowing students to handle it, according to local news media.

Alexander has also resigned from the Sand City Police Department. The chief there said Alexander broke rules requiring safe handling of weapons and keeping them out of the hands of others.