Manny Rieta was born in Hawai'i in 1944. He became a soldier, and in the 1960s he was send to Vietnam, where his entire platoon was killed. Rieta revived as an Immortal, and was later found by Jacob Kell. Kell took Rieta into his gang of Immortals, he didn't care about The Game or the rules, and used Rieta and the others to hunt down and wound Immortals so he could take their heads with ease.
Some time later, they attacked Duncan MacLeod at Connor's former antique store. Rieta fought against Duncan together with Carlos Dash, Winston Erhuero and Cracker Bob. Even with the advantage of four against one, they could not manage to defeat Duncan.
Jin Ke arrived, and fought with MacLeod. Rieta and the rest of the group retreated. Kell broke off the fight, but Duncan was then shot by Carlos, and fell out the building. Kell beheaded Carlos in anger, and they left.
Eventually, Kell gathered all of his followers for a last supper, Kell took two swords and beheaded Rieta and the others.