Born in Thames on 22 February 1944, Deacon was the son of George Deacon and Olive Susie Deacon (née Abbott).[2] His uncle, Edwin Abbott, also played for the New Zealand Kiwis.[3]
Deacon was included in the Kiwis squad for the 1970 World Cup and played his last test match for New Zealand in 1971. He finished his career having played in fourteen tests for New Zealand.[6]