Paralympic equestrian athlete dies at age 21

• Paralympian from Texas died Sunday
• No cause of death was immediately known
• Wentz was fourth in individual test in London

Jonathan Wentz, a Paralympic athlete in the sport of equestrian, died Sunday at the age of 21.

A cause of death was not immediately known, according to a spokesperson with the U.S. Equestrian Federation.

Wentz competed at the London Paralympics, finishing fourth in the individual test and fifth in the freestyle test in Grade 1b competition riding Kai Handt's NTEC Richter Scale. He was also a member of the U.S. team that finished seventh.

Wentz, who resided in Richardson, Texas, was born with cerebral palsy. He took up riding at age 2 and by 5, he began therapy at Equest, a riding center in Wylie, Texas, where he began vaulting and jumping.

Heading into the London Paralympics, Wentz trained at North Texas Equestrian Center. With NTEC Richter Scale, Wentz won the USEF 2011 National Para-Equestrian Championship.

He was a student at Southern Methodist University.

Wentz's parents, James and Tina Wentz, posted on Facebook. "He was taken suddenly from us and has left a hole in our lives that will never be filled. He loved life and lived it each day giving his all toward his riding, school, family and friends."

A memorial service will be held Saturday in Dallas.