Police in Jeannette, Pennsylvania, have charged a 16-year-old boy with murder, accusing him of killing a classmate and then taking a selfie of himself with the body and posting it online.

According to the Pittsburgh Tribune-Review, Maxwell Marion Morton, 16, shot Ryan Mangan, 16, in the face. Mangan's mother found his body on Wednesday in their home.

Morton reportedly took a photo of himself with the body and sent it to a friend using the cell-phone app SnapChat. The friend saved the photo and showed it to his mother, who then notified police.

District Attorney John Peck, who has been a prosecutor for more than 30 years, tells the Tribune-Review that he's never had a suspect take a picture of themselves with the victim.

"I've never seen it before," Peck said, "but it was a key piece of evidence that led investigators to the defendant."

Morton also reportedly sent text messages that read, "Told you I cleaned up the shells," and "Ryan was not the last one," the Tribune-Review reports.

An affidavit says Morton confessed to the killing after police searched his home and found a 9mm handgun.

Morton, who has been charged as an adult, is being held without bail in a juvenile detention center on charges of first-degree murder, homicide and possession of a firearm by a minor, the Tribune-Review reports.

Mangan's funeral Mass is at 10 a.m. Monday.