Michael Shoun thinks he did not deserve a life sentence without parole.

That’s because he feels there were errors during the trial. He’ll state his case for a new prison term to the Indiana Supreme Court on Oct. 6, according to the court’s calendar.

Prosecutors say 28-year-old Michael Shoun stabbed Tiana Alter and mutilating her body at his home near Elkhart in November 2013. Authorities say Shoun and the victim were high on synthetic marijuana at the time.

A jury convicted Shoun after deliberating for two hours on Dec. 2. Jurors recommended a sentence of life without parole.

Chief Deputy Prosecutor Vicki Becker says synthetic marijuana is a problem in Elkhart County. Becker says the prosecutor’s office and police have cracked down on several stores in the city of Elkhart that sold synthetic marijuana.

The Associated Press contributed to this story.

RELATED: Michael Shoun sentenced to life without parole for stabbing death of 17-year-old girl