I am not sure from your question if the person you are concerned about is already in prison or fighting their charges still. Here is the link to the MI parole process: http://www.michigan.gov/corrections/0,4551,7-119-1384-22909--,00.html
There is no confidentiality online. The accused is presumed innocent until proven guilty beyond reasonable doubt. If you cannot find a local attorney on , a good place to look is the website for the National Association of Criminal Defense Lawyers (NACDL.org) Speak to several attorneys and hire the one that makes you feel confident and comfortable.
NACDL local members: http://tinyurl.com/8ru8wtv (https://www.nacdl.org/impak/cms/members_online/members/findalawyer.asp)
NACDL Local affiliates: http://tinyurl.com/8akw2gd
Under Michigan's "Truth in Sentencing" laws, there is no good time granted, and no early release. The prisoner gets a sentence which, for attempted murder, could be life, or could be a numeric sentence with a minimum and a maximum. If there is a minimum and maximum, the prison is not allowed to let the prisoner go until he has served the minimum.
If the sentence is life, he could be considered for parole after serving 10 years, and could hire someone to help with that effort, however, paroles after 10 years on a life sentence are unheard of. At least, I have never heard of any. I know someone recently paroled on a life sentence who served 38 years.
When the person is approaching the end of his minimum sentence, he might choose to get some professional assistance from an attorney, but it is unclear how helpful that would turn out to be. In many cases, the decision to grant or deny parole on the minimum will be clear to the parole board members, and therefore persuasion would not change anything. However, in a small class of cases, it might be that an attorney could make the difference between parole and a continued stay in prison. Good luck.