Witness: Robuck admitted to stabbing Newton teen

Several acquaintances of Justin Alan Robuck and convicted murderer Tyler Ray Oberhart testified during Robuck’s first-degree murder trial Thursday, including Oberhart’s ex-girlfriend, who said Robuck admitted to stabbing 19-year-old Jerry Alden Pittman II. Twenty-year-old Mishana Laura Cornejo was one of two Newton females — along with 18-year-old Courtney Patricia Hummel — who waited for Robuck, Oberhart and Ray Robert Travis in an alley behind Pittman’s residence while the three young men confronted the Newton teenager in the early morning hours of Saturday, Oct. 6, 2007. Cornejo testified for several hours both Wednesday and Thursday at the Dallas County Courthouse in Adel, stating she heard Robuck claim to have stabbed Pittman multiple