He is portrayed by Christian Slater.
After one of Boyd's friends accidentally kills a prostitute in Vegas during a bachelor party, Boyd coldly and logically explains to the rest of his friends that they will have to bury her body in the desert.
He then kills a hotel security guard who comes up and discovers the body, and the five friends dismember and bury both bodies. Boyd soon after becomes more sociopathic and addicted to killing, and leaves a trail of bodies that culminates at the wedding of his friend Fisher.
In self-defense, Fisher beats Boyd to death, and his body is buried in the desert along with the prostitute and the guard.