PITTSBURGH — Hribal's lawyer argues the defendant was too mentally ill to appreciate the wrongfulness of his behavior when he stabbed the victims at Franklin Regional High School in Murrysville.
Hribal turned 19 last month, but was just 16 during the April 2014 rampage.
Hribal is charged with 21 counts each of attempted homicide and aggravated assault and a school weapons violation.