Road Rules star Brian Lancaster has passed away, reports TMZ. He was 43 years old.

Lancaster participated in the seventh season of the MTV reality series, which took place in Latin America in 1999. That season, Lancaster, then 23 years old, participated in 13 missions over 15 episodes in Mexico and Costa Rica.

Though the news is breaking now, Lancaster passed away on Thursday, Mar. 29. The cause of his death is unknown, but TMZ says the Lancaster family believes he died of heart failure, as he had a history of arrhythmia.

Lancaster's obituary describes him as: "A spiritual explorer, dreamy stargazer, inquisitive world traveler and barstool philosopher who enjoyed a good mind meld, Brian exceled at being a human being rather than a human doing. Constant in his soul and spirit, he would share possessions, thoughts and every part of his essence with anyone who came into his orbit."

This is the second Road Rules cast member to die in the past year. Danny Dias, who was part of Season 13, was found dead in June 2017.