Classmates, friends and family hold a memorial service for a Pennsylvania teenager who, police say, was shot dead by a classmate who posted a selfie with the victim's body.

The internment of Ryan Mangan, 16, happened Monday morning at Jeannette's Sacred Heart Church. He was found dead with gunshot wounds in his home on February 4.

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Classes in Jeannette's school district were moved two hours so students can attend the funeral.

A friend of the Mangans has put up a GoFundMe page in the wake of the victim's death to help with funeral costs. So far, it has raised more than $5,000.

Authorities have arrested Maxwell Morton, 16, who also hail from Jeannette. He is now facing charges of homicide, first-degree murder and possession of a firearm by a minor.

Investigators said they identified the suspect through a self-photograph he took. They said the photo showed Morton next to Mangan's body, which police found in the same condition and position.

Witnesses said the suspect shot the victim in the face before posing with his body in a selfie posted on Snapchat.

Morton has to appear for an initial hearing on February 19.

He was taken into custody after investigators got a copy of the picture, which was sent to another boy through Snapchat that automatically erases messages within seconds unless they are recorded.

A police affidavit said authorities got hold of the image which showed the victim slumped on a chair with a gunshot wound to the face.

The mother of the witness who saved the photo got in touch with police, saying her son also got text messages saying "Ryan was not the last one" and "I told you I cleaned up the shells."