Jamar Mays was sentenced to 90 days in jail for missing a Dec. 7 appointment with a probation officer.
Mays, 18, was given five years of probation in November for the 2009 shooting death of Ali Shalash. Fayette Circuit Judge Ernesto Scorsone sent Mays back to jail last week after Mays failed to report to the probation office.
During a Thursday probation revocation hearing, Mays told Scorsone, "I just got confused" about two different appointments.
But Scorsone displayed anger with the teen.
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"How are you going to function as an adult?" Scorsone asked Mays. "I'm not sure you're ready to be on probation. ...This is serious stuff, buddy."
The 90-day sentence means Mays will not be able to start classes at a technical school in January. Once he finishes the 90-day sentence, he will be back on probation, Scorsone said.