Callahan admits to killing wife as part of plea to forgo new trial By GREG KLEIN • Special to www.AllOTSEGO.com Casey Callahan pleaded guilty to manslaughter in the second degree Monday, May 3, in Otsego County Court, ending, for the second time, the criminal proceeding concerning the 2000 death of Callahan’s wife Elizabeth Welsh Callahan. Callahan, 54, admitted Monday that he backed over his wife with his truck in Sayre, Pennsylvania in 2000, killing her. He told Judge John Lambert,…