Murderer Dies Awaiting Execution:  A double-murderer was found dead in his Ohio prison cell Saturday.  Tracy Connor of NBC News reports that Alva Campbell's execution was called off last year after corrections officials were unable to find a vein suitable for a lethal injection.  Campbell, who was suffering from several diseases, was rescheduled for execution next year.  The Franklin County prosecutor told reporters, "Due to 20 years of frivolous post-conviction litigation, he successfully ran the clock out on justice due to the state and the victim's family."  Holly Zachariah of the Columbus Dispatch described Campbell's criminal record, which included the barroom murder of a man in 1972 and a string of robberies.  While in prison for that murder, Campbell was scheduled to be tried for the robberies.  Claiming paralysis, he was transported to court in a wheelchair.  At the courthouse, he jumped from the chair, attacked an officer, taking her gun, then hijacked a pickup, kidnapping its owner, 18-year-old Charles Dials.  After driving around for a while, Campbell executed Dials with two shots in the head.