Ryan Knight, who appeared on MTV's "The Real World: New Orleans" in 2010 and "The Challenge" in 2013 died at the age of 28. The network announced on Thursday, "The Real World family has lost another member."
It was the second death of a "Challenge" cast member in November.
Knight's girlfriend, Makenzie Jauer, then shared this heartbreaking post on Instagram, calling Ryan her "sweet angel."
Knight's reality TV co-stars also responded to the news of his death on Twitter Thursday:
Recently, Knight posted a picture with fellow "Challenge" cast member Diem Brown who died on Nov. 14 after battling cancer.
On Nov. 24, he wrote, "Have the type of life, that when you die no one will dare say, 'he left us for a better place.'"