A judge sentenced Sebastian W. Olivares-Coster to three life sentences Friday afternoon in District Court.
Olivares-Coster, a Helena teen, pleaded guilty to killing one boy and trying to kill two others in a June shooting.
Judge Dorothy McCarter sentenced Olivares-Coster, now 18, to life in prison on a deliberate homicide charge and handed him life sentences for each of two counts of attempted deliberate homicide. The sentences for attempted homicide will run concurrently with each other and consecutively to the life sentence for the deliberate homicide charge.
Olivares-Coster will be eligible for parole in 60 years.
Olivares-Coster pleaded guilty in November to killing 16-year-old Cory Andrewski and injuring 16-year-old Joey Wohlers and 15-year-old Kahner Leary.
Olivares-Coster pretended to be another teen and lured the three victims to a south Helena hillside on June 3, then shot them without provocation.
Before reading her sentence, McCarter said she had never before had a case in which she listened to a full day of testimony and still had so many unanswered questions.
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"I still don't know what was going on in Sebastian's head," she said. "None of it makes sense."
There were no justifications for his actions, and the explanations given during the sentencing hearing didn't connect, she said. McCarter told those in the court that she wished she knew a possible motive.
"It'd make me feel like I had some ground to stand on and impose the perfect sentence," she said.
McCarter said she had many reasons for her decisions, including the severity of the crimes, the fact that Olivares-Coster's acts were planned and deliberate, and- because she does not know why Olivares-Coster did it - she has no idea if he'll potentially do it again.
The sentencing was originally slated for Feb. 26 but was postponed pending a mental health evaluation at the state mental hospital.
For more details, see Saturday's Independent Record.