UFC heavyweight and former two-time WBC Muay Thai World Heavyweight Champion Shane Del Rosario has died.

According to his management, the 30-year-old fighter suffered a “catastrophic cardiovascular collapse” at his California home on the morning of Nov. 26. The fighter was taken to Hoag Memorial Hospital Presbyterian in Newport Beach, Calif. under full cardiac arrest, but was resuscitated in the emergency room and placed in intensive care with a stable heart rhythm and blood pressure.

However, on Thanksgiving, his trainer, Colin Oyama, revealed that the fighter had no brain activity and his family had opted not to keep him connected him to a life support machine. Del Rosario’s manager, Jason House of Iridium Sports, revealed that doctors believed Del Rosario may have suffered from a rare condition called Long QT Syndrome. The condition is a genetic anomaly that can cause a sudden and life threatening heart rhythm abnormality, and may result in sudden death.

Del Rosario went 11-2 in MMA competition and 8-1 in the kickboxing ring during his seven-year career. Seven of his wins in MMA competition came via first-round knockout and all eight of his wins in kickboxing came via stoppage. The fighter opened his MMA career 11-0 over the course of five years.

The fighter was involved in a massive car accident in April of 2011 that kept him out of competition for over a year. He contemplated retirement following the accident and the subsequent back injuries, but the former Strikeforce fighter made a full recovery and twice competed in the UFC’s Octagon, falling short against Stipe Miocic and Pat Barry in 2012.

Del Rosario was expected to compete for the first time in 2013 against Guto Inocente at UFC 168 in December, but recently pulled out due to a rib injury. Similarly, he was forced out of a bout against Dave Herman at UFC 162 in July due to injury.

Photo: Shane Del Rosario (Esther Lin/MMA Fighting)