WICHITA – A registered sex offender residing at Larned State Hospital pleaded guilty Monday to sending obscene material to a minor while he was a patient at Larned State Hospital, U.S. Attorney Barry Grissom said.
 Christopher M. Case, 34, pleaded guilty to one count of transferring obscene material to a minor. In his plea, he admitted that he resided in the Sexual Predator Treatment Program at LSH when he committed the crime. In mid-2011 he obtained access to a smartphone, which he shared with other residents. In December 2011 and January 2012 he learned that another resident of the program was using the smartphone to communicate with a 13-year-old female via email and chat. The girl was in Montana.
 On January 16, 2012, Case used the smartphone to send the girl video of himself masturbating.
 Sentencing is set for June 30. Both parties have agreed to recommend a sentence of 20 years in federal prison. Grissom said the case involved the Wichita Police Department’s Internet Crimes Against Children Task Force, the Kansas Attorney General’s office, Assistant U.S. Attorney Jason Hart and Steve Karrer of the Kansas Attorney General’s Office.