As a drug smuffler inderectly involved in the death of Frank Castle's family. Hector Montoya was imprisoned in Ryker's island. He later encountered the unwitting Castle in prison, and the two men fought side by side against attackers. A skilled poisoner, Montoya sent out toxin-laced letters to his enemies while still in prison.
After Montoya was released, Jason Hunt, the son the banker the Costa Family had executed that fateful day in Central Park, sought to kill Montoya, but the Punisher stopped him. In a second confrontation with Hunt, Montoya was killed after Hunt's dog tore his gloves, spilling toxin on Hector's hands.