Sean Mooney broke into tears when jurors determined he was guilty Friday of first degree murder for the 2008 slaying of 77-year-old Robert Deming.

Deming was shot from behind as he sat in the living room of his home.

Prosecutors had argued that Mooney killed his grandfather for financial gain because he was about to lose the free rent he received while living on his grandfather's five-acre property in the community of Schellville.

Mooney is scheduled to be sentenced on Aug. 19.