(KAIR)--A Saint Joseph teenager, charged in connection with a crash that left four teens dead, pleads guilty.

KQ2-TV reports 18-year-old Skylar Lucas-Cox entered the plea Monday, admitting to involuntary manslaughter and assault.

He earlier entered a plea of not guilty, but said in court Monday he believed he would be found guilty due to evidence in the case.

Prosecutors say Lucas-Cox tested positive for cocaine, marijuana and alcohol at the time of the crash.

He was charged in April after authorities said he was driving a stolen truck that crashed head-on into an oncoming vehicle on Saint Joseph's Riverside Road, at the Cook Road intersection.

His four passengers, ranging in age from 15 to 17, died in the crash.

The driver in the second vehicle was not hurt.

Sentencing is set for November 6.

Lucas-Cox faces up to 27-years in prison.