HOWELL (WWJ/AP) – A trial is set to begin for a man charged in a series of shootings on and off Interstate 96 in Michigan.

Raulie Casteel is scheduled to go on trial Tuesday in Livingston County Circuit Court in Howell. He pleaded no-contest in November to related charges in neighboring Oakland County and is awaiting sentencing.

READ MORE: Big Brother 24 Features Michigan Native, Taylor Hale

The 44-year-old unemployed geologist is suspected of carrying out two-dozen random shootings along a 100-mile I-96 corridor through four counties in late 2012. Police say they matched Casteel’s gun to bullet fragments recovered from victims’ vehicles.

No one was seriously hurt.

Michigan’s attorney general is prosecuting Casteel on terrorism and other charges in Livingston County. If convicted as charged, he faces up to life in prison.

READ MORE: Detroit Police Looking For Suspects, Persons Of Interest In Holiday Shootings

Defense attorney Douglas Molkauf told a District Court judge that his client will not use an insanity defense. But he does say Casteel suffers from “serious mental problems” and “delusional disorder.”

On professional websites, Casteel described himself as a geologist and soil scientist with experience in environmental cleanup. He is a Michigan native who lived in Taylorsville, Ky., before returning to his home state. Prior to his arrest, Casteel lived with his wife, daughter and in-laws in Wixom.  Defense attorneys say he has no criminal history.

Click here to catch up on this case.

MORE NEWS: Annual Mackinac Bridge Walk Returns This Year: Here's What To Know

TM and © Copyright 2014 CBS Radio Inc. and its relevant subsidiaries. CBS RADIO and EYE Logo TM and Copyright 2014 CBS Broadcasting Inc. Used under license. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.