Jordan Hartz pleaded not guilty to multiple charges Friday after he was accused of entering Waukesha North High School and threatening to kill his ex-girlfriend's friend, according to the criminal complaint. 

Hartz, 18, faces charges that include carrying a concealed weapon, possession of narcotic drugs, disorderly conduct and misdemeanor bail jumping.

The suspect waived his right to a preliminary hearing and the court bound him over for trial, reported FOX 6.

According to the criminal complaint:

Hartz was mad that his ex-girlfriend's friend got on the phone to calm him down and threatened the male friend. He forced himself into the school — where he was expelled from previously — and attempted to force himself into the ex-girlfriend's English class.

After Hartz left the building, a Waukesha police officer saw his vehicle after an attempt-to-locate call was sent via dispatch. Hartz had unpaid parking tickets, so the officer pulled him over for suspended registration.

A police officer located a 10-inch long hunting knife beneath his driver’s seat, syringes and other heroin paraphernalia, and a metal tin that tested positive for heroin.

Hartz faces up to 3 years and 2 months in prison if convicted. He will appear in court for a hearing at 9:30 a.m. March 4.