The quote comes from a Lincoln JournalStar article that may be found here. The article further states:
Donald Peacock was a year into a 40-to-50-year sentence from Dodge County, and Shon Collins had served about five years of a 66-to-80-year sentence out of Box Butte County.
Both men were 46. Prison officials believe they were both killed by other inmates.
When Peacock was sentenced in March 2014, prosecutors said he used hidden cameras to make child pornography and that he sexually assaulted a boy on a weekly basis for more than seven years.
. . .
Collins was sentenced to 66 to 80 years in prison after meeting an Alliance teenager online and driving from his home in Leavenworth, Kansas, to have sex with her at a motel. She was 13.*
*That child sex offenders have a rough time in many prisons is old news. For example, in 2003 John Geoghan, a former Roman Catholic priest whose sexual abuse conviction sparked a widespread abuse scandal in the Catholic Church, was killed by a fellow inmate who claimed he was chosen by God to kill pedophiles.