Keebler, 18, was convicted Thursday night of first-degree murder for stabbing 78-year-old Douglas Orville Wright to death last November. He also was convicted of burglary, armed robbery and grand theft of a car in the attack on Wright on Nov. 15 in Wright's Spring Hill home. In a taped statement, Keebler told authorities he killed Wright so he could take his Ford Thunderbird for a joy ride.