I would start by contacting the St. Joseph County public library. The local history or genealogy dept might have a file about the case. They may also have back issues of the local newspaper on microfilm.
You might try contacting the St. Joseph County District Attorney office or the Clerk of Court. Ask how much it would cost to have the court records copied and mailed to you.
You might try contacting the St. Joseph County Genealogy Society. They may have a volunteer who can help with this research.
I found 2 newspapers articles. I can send them to you in an e-mail