The son of country singer Craig Morgan is missing after a boating accident Sunday in Tennessee, People reports. Jerry Greer, 19, was tubing on Kentucky Lake at the time. TMZ reports that a boat pulling an inner tube was in an accident of some kind. Sources say it was a "freak accident" and there were no initial signs that drinking was involved. Greer was said to be wearing a flotation device at the time. A search is underway. (More Tennessee stories.)