WOBURN – A New York man has been found guilty today on murder charges in connection with the shooting death of Justin Cosby, 21, of Cambridge, Middlesex District Attorney Gerry Leone informed the public today. Jabrai Jordan Copney, 22, of New York City, New York, was found guilty by a Middlesex Superior Court jury on charges of First Degree Murder and Carrying a Firearm Without a license. Middlesex Superior Court Judge John Lu sentenced the defendant to life in prison with no eligibility for parole on the murder charge and two and one half to three years in prison to run concurrent on the firearm charge. “A manipulative and calculating Jabrai Jordan Copney has been found guilty today of arming himself with a gun that he used to rob and kill Justin Cosby. Copney then executed his plan in a dormitory basement stairway area that was a virtual dead-end with no way out, fatally shooting Justin Cosby when he attempted to struggle and get away. Copney then attempted to cover up his crime...