FILE - This Feb. 9, 2013 file surveillance photo provided by the FBI shows 73-year-old Walter Unbehaun, an ex-convict from Rock Hill., S.C., during a bank robbery in Niles, Ill. Unbehaun allegedly told investigators he intended to get caught so he could live his final years behind bars. On Thursday, April 17, 2014, Unbehaun is scheduled to be sentenced in Chicago. In 50 years, he has spent just six out from behind bars. His case highlights a wider societal dilemma about what to do with an increasingly elderly ex-cons, many of whom spent so much of their lives inside prison that they, like Unbehaun, can't cope with life on the outside. (AP Photo/FBI, File)
Members of the ATF and FBI search a house belonging to Fraiser Glenn Cross, also known as Frazier Glenn Miller, near Marionville, Mo., The Lawrence County Mo. sheriff and Missouri State Highway Patrol are also on the scene. (AP Photo/Springfield News-Leader, Nathan Papes)
Workers repair a neighbor's front door, rear, blown off during a raid when FBI agents on Wednesday rescued Frank Arthur Janssen, of Wake Forest, N.C., from an apartment, foreground, in a housing complex in Atlanta, Thursday, April 10, 2014. John Strong, FBI special agent in charge in North Carolina, said Janssen's kidnapping was related to his daughter's prosecution of North Carolina prisoner Kelvin Melton, who is serving a life sentence for his 2012 conviction for being a habitual felon. (AP Photo/David Goldman)
Workers repair a neighbor's front door, at right, blown off during a raid when FBI agents on Wednesday rescued Frank Arthur Janssen, of Wake Forest, N.C., from an apartment, at left, in a housing complex in Atlanta, Thursday, April 10, 2014. John Strong, FBI special agent in charge in North Carolina, said Janssen's kidnapping was related to his daughter's prosecution of North Carolina prisoner Kelvin Melton, who is serving a life sentence for his 2012 conviction for being a habitual felon. (AP Photo/David Goldman)
In this photo taken from video, FBI agents collect evidence at an apartment in Atlanta, Thursday morning, April 10, 2014, where federal agents rescued kidnap victim Frank Arthur Janssen, of Wake Forest. N.C. John Strong, FBI special agent in charge in North Carolina, said the kidnapping of Janssen was related to his daughter's prosecution of North Carolina prisoner Kelvin Melton, who is serving a life sentence for his 2012 conviction for being a habitual felon. (AP Photo/Johnny Clark)