He was renowned for his pace and aggression in his fights and was part of the London Fight Factory.
MMA commentator Michael Morgan said: “Absolutely shocked to hear the news this morning. A true gentleman inside and outside the cage. Rest in peace Jahreau Shepherd.”
Film director Bobby Razak, synonymous within MMA, added: “RIP Jahreau Shepherd may your journey continue in bliss.”
Shepherd had previously been signed to Cage Warriors and also fought in Bellator, UCMMA and Fusion FC.
He beat Quinten de Vreught by unanimous decision in Norwich in February at Contenders 29 to win the welterweight championship.