McKINNEY, Texas (AP) A North Texas man has been sentenced to 50 years in prison for killing a teenager whose body was dumped in a rock pit in 1984.

Collin County prosecutors say 50-year-old Alonzo Grayson Jr. was sentenced Thursday after a jury earlier in the day found him guilty in the death of 18-year-old Bobby Ray Taylor.

Authorities say Grayson was dating Taylor's younger sister when the couple shot the teen outside a Frisco pool hall in January 1984. Bobby Taylor and Grayson were angry with each other because Taylor objected to Grayson dating his sister. The couple took the injured Taylor to the rock pit where Grayson shot him twice more.

Authorities say a break in the case occurred in 2011 when Taylor's sister attempted to reconcile with her estranged son and told him of the shooting. The son then contacted police.