( CNN ) -- A second man has been charged with murder in the 2011 disappearance of Tennessee nursing student Holly Bobo . Other suspects can expect police to be `` on their doorstep '' soon , Tennessee 's top investigator told reporters Tuesday . Jason Wayne Autry , who is already in prison for an unrelated assault conviction , was indicted on especially aggravated kidnapping and first-degree murder charges by a special grand jury Tuesday , Tennessee Bureau of Investigation Director Mark Gwyn said at a news conference in Decaturville Tuesday afternoon . Autry , 39 , was a longtime friend of Zachary Adams , 29 , who was indicted last month on the same kidnapping and murder charges , Gwyn said . Autry , from Holladay , Tennessee , has a lengthy criminal history , he said . Bobo was 20 when she was last seen on April 13 , 2011 . Her brother told authorities he saw a man in camouflage leading her away from their home in the small town of Darden , Tennessee . Information from `` several witnesses '' led to charges against Autry , Gwyn said . Investigators `` believe there are more people with information and possible involvement , '' Gwyn said . He told reporters to `` expect more announcements in the coming days and weeks . '' `` These individuals know who they are , and I 'm sure they are watching , and they can expect us to be on their doorstep pretty soon , '' Gwyn said . Although Gwyn has previously declined to say whether any remains have been found , he acknowledged Tuesday that her body has not been located . Investigators are `` doing everything we can to try to get ( her family ) some closure '' by finding Bobo 's body , Gwyn said . The Bobo case rocked the largely rural swath of central Tennessee , from those who knew the young woman to others who rallied behind the effort to find her . Hundreds of volunteers -- some on horseback and foot , others on all-terrain vehicles -- turned out to hunt for clues in Decatur , Henderson , Henry , Carroll and Benton counties . Many more attended memorial services or offered supportive thoughts online via groups on Facebook . More than $ 450,000 has been offered in reward money .
Other people will have a ` ` on their hands '' soon , top investigator says . Suspect Jason Wayne Autry is already in jail for an unrelated assault conviction . He is a longtime friend of suspect Zachary Adams , who was indicted last month . Bobo 's body has not been found 3 years after her disappearance .