FORT WORTH, Texas (AP) - A spokesman for T. Boone Pickens says a grandson of the oil tycoon has died.

Pickens' spokesman Jay Rosser said Tuesday that the death of Thomas Boone Pickens IV is an "unspeakable family tragedy." He asked that the family be allowed to grieve in private.

Neither Rosser nor Fort Worth police have said what may have caused the death of the TCU junior, who went by the name Ty.

A police spokeswoman says officers responded to a report of a dead person at an off-campus location around 9:30 a.m. Tuesday. Ty Boone Pickens was transported to a hospital, where he was pronounced dead.

Police say the Tarrant County medical examiner will determine the cause of death.

(Copyright 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)