BOISE, Idaho (KLIX) The Ada County Sheriff's Office is investigating the apparent suicide of an inmate at the Idaho Maximum Security Institution south of Boise. According to the Idaho Department of Correction the 69-year-old inmate was found in his cell at 9:18 p.m. on Saturday. Officials say the inmate died Thursday evening at a Boise Hospital. The inmate was serving time for driving under the influence.