People serving a life sentence in prison who are suffering with a terminal illness, dementia or other mental impairments have the option to request parole at the end of their lives. It’s not an easy process to do on their own, so state representative Mindy Domb filed a bill that would give these people a legal advocate and expedite the process, so the bureaucratic system doesn’t leave a dying person behind bars.   The bill, which was also filed in the senate by Senator Pat Jehlen, would require cognitive screenings of all adults in prison who are 55 years old and older. Anyone deemed eligible for medical parole would be allowed to have a family member or legal advocate file for parole on their behalf. Domb said she credits the Boston-based organization Prisoners Legal Services with bringing the issue of medical parole eligibility to her attention.