First of all, in this day and age with Sentencing Guidelines, there is no over sentencing in Michigan. If anything, there is under sentencing. If he was given 30 to 50 years, it was a nasty case. Second, your fiance should not have any major misconducts or minor misconducts. Third, he killed someone. The public has to be protected. The State of Michigan has a program to help prepare prisoners for release in the outside world. If he is placed on parole, the parole officer and the staff involved in the MPRI program, if it is still around, will assist him.
Do the words "Habitual Offender" mean anything to you? How long have you known your "fiance"? Did you meet him through the computer or mail?