05/28/2013 02:49 pm ET

Julianne Siller, Pennsylvania Teen, Murdered By Boyfriend Tristan Stahley During Break-Up, Police Say

An argument between two teenagers turned deadly when a boy fatally stabbed his girlfriend on a suburban hiking trail, authorities in Pennsylvania say.

Tristan Stahley, 16, was arrested Saturday after officials say he confessed that he murdered his girlfriend to his mother, NBC Philadelphia reports. Police later found 17-year-old Julianne Siller in a forest, lifeless with multiple stab wounds to her neck and body.

The couple was walking through Palmer Park in Skippack Township, Pa., when they got into an argument about Siller "going out too much," according to the station. Stahley said they were breaking up when he took out a knife and attacked his girlfriend, police say.

Stahley then returned home -- crying and covered in blood -- and told his mother about the incident, ABC6 reports. He allegedly attempted to take his own life, but his father subdued him and wrestled a knife away.

When police visited the park, they found Siller's body, dragged off the trail to a densely wooded area. She was just weeks away from graduating at Spring Ford High School and enrolled at Penn State Altoona for the fall semester.

A friend of Siller said he had cautioned her about Stahley.

"We always just told her, you've got to keep your distance and break it off," Rhett McDonald told CBS Philly.

A Facebook group titled "R.I.P. Julianne Siller" was created in the victim's memory.

Stahley is being held at the Montgomery County Correctional Facility without bond, according to the Philadelphia Inquirer. He is charged with first-degree murder, third-degree murder and possession of a weapon.



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