The bodies of the killers were exhumed December 18, 2012, from Mount Muncie Cemetery, as authorities hoped to solve a 53-year-old cold case using DNA. The two were questioned about the December 19, 1959 shooting murder in Osprey, Florida, of Cliff and Christine Walker and their two young children. Smith and Hickock had fled to Florida after the Clutter murders. A polygraph administered at the time of their arrest in the Clutter case cleared them of the murder, but by modern polygraph standards, their test results are no longer considered valid. On December 19, 2012, officials in Kansas exhumed the bodies of Smith and Hickock and retrieved bone fragments in order to attempt to compare their DNA to semen found in the pants of Christine Walker. In August 2013, the Sarasota County Sheriff's office announced they were unable to find a match between the DNA of Perry Smith or Richard Hickock with the samples in the Walker family murder. Only partial DNA could be retrieved, possibly due to degradations of the DNA samples over the decades or contamination in storage, making the outcome one of uncertainty (neither proving nor disproving the involvement of Smith and Hickock). Consequently, investigators have stated that Smith and Hickock still remain the most viable suspects.