Police say Matthew Joseph Fischer allegedly stabbed a classmate to death after he messaged his girlfriend on the app

By Tara Fowler
Updated January 21, 2015 03:35 PM
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Credit: Live5News WCSC

A Snapchat message led to a fatal stabbing in South Carolina on Sunday, Mount Pleasant police say.

Matthew Joseph Fischer, 16, was visiting his girlfriend when she received a message from 17-year-old Lucas Bennett Cavanaugh, according to an arrest affidavit obtained by PEOPLE. Messages sent via the Snapchat app are only visible for a brief period of time.

Fischer then used his girlfriend’s device to respond to Cavanaugh, allegedly writing “Come over” and “I’ll kill you, man,” the affidavit reads.

Cavanaugh got in his Volkswagen Jetta and drove to the girl’s home in an upscale suburban neighborhood, where the two boys got into a fight.

Fischer allegedly pulled a knife and fatally stabbed the 17-year-old in the torso, according to the affidavit. He fled the scene immediately afterwards.

When police arrived, they found Robynn Davis, the mother of the suspect’s girlfriend, comforting the victim as he took his last breaths, according to an incident report provided to PEOPLE.

After fleeing, Fischer called his mother, who picked him up and took him back to the scene of the crime, where he was taken into custody and read his Miranda rights, the affidavit states.

Davis told local paper The Post and Courier that she “loved and adored” Cavanaugh, one of her daughter’s closest friends.

“He meant the world to me,” she said. “The world was a better place with him in it.”

Fischer has been charged with murder. Though he is just 16, he is being charged as an adult due to the violent nature of the crime.