<sod >" Shyback was convicted of manslaughter in May, after Nation ruled he used excessive force in defending himself against Mitchell, 31. He testified she had menaced him with a large knife while they argued in their home, but after he was able to make her drop it he choked her to death.< eod>< sod > " Shyback was convicted of manslaughter in May, after Nation ruled he used excessive force in defending himself against Mitchell,< eod>