Less than a week after being indicted for allegedly tampering with evidence in a homicide investigation, Douglas County's CSI commander is being sued in federal court by one of the men who was wrongfully charged in the double-murder case.

On Sunday, Nicholas Sampson filed paperwork to add David Kofoed and the Douglas County sheriff's office to a 2007 lawsuit filed in U.S. District Court against the Nebraska State Patrol and the Cass County sheriff's office.

The amendment says Kofoed violated Sampson's constitutional rights when he planted a speck of Wayne Stock's blood in a car Sampson had driven.

Sampson spent five months in jail after being wrongfully charged in the 2006 deaths of Wayne and Sharmon Stock of rural Murdock.