The 2015 graduate of Torrey Pines High School accused of posting a cryptic message on social media along with a picture of an AR-15 is being treated in a county psychiatric hospital following his arraignment on criminal charges.
On May 30, school administrators canceled classes, a senior awards night event, and several athletic banquets because of the message posted on Instagram.
Kevin Gregory Matlak, 21, was arraigned Wednesday and pleaded not guilty to one felony count of making criminal threats toward his alma mater.
Matlak’s defense attorney said his client voluntarily admitted himself into a psychiatric facility.
Prosecutors say Matlak has a festering resentment toward the campus and staff that stems from his inability to walk at graduation due to a job and other responsibilities.
An investigation was launched by SDPD Northwestern Division and in coordination with school administration and district officials upon reports of the threat, police said.
SDPD took Matlak into custody without incident at around 1 p.m. on June 1.