OMAHA, Neb. (AP) – Authorities say no evidence was turned up in a search at the home of the parents of a man convicted of killing an Omaha college student. Douglas County Sheriff Tim Dunning said Thursday there had been several tips about a new patio that had been poured in the home’s backyard about the time that 19-year-old Jessica O’Grady disappeared in 2006. Her body was never found. No evidence turned up after the patio at the Omaha home of Christopher Edwards’ parents was torn up and ground beneath and around it was searched. Edwards was convicted of second-degree murder and a weapons charge in 2007. Edwards was sentenced to 100 years in prison.