 He died in prison from cancer in 2006 at age 55.Despite thousands of hours of police investigation, as well as Burger Chef offering a reward of $25,000 to anyone who could capture the murderers or provide information about their whereabouts, the attackers were never prosecuted, and the case remains officially unsolved.Indiana state police continue to hold the case open, and have reportedly investigated the use of DNA-tracing techniques developed since the initial investigations.