The third person to take the codename Viper was a member of Sin's Serpent Squad. His teammates needed him to prove his worthiness despite the number of people he killed to gain his position in the team.
Along the rest of the Serpent Squad (minus Sin) Viper worked for the new Hydra.
After being captured by Captain America he was put in witness protection in exchange for information about Hydra. Weeks after starting a new life he was killed by the new Scourge.
Projects venomous darts and poisons at his opponents.
- 9 Appearances of Leon Murtaugh (Earth-616)
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- 3 Images featuring Leon Murtaugh (Earth-616)
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- Characters killed by Viper
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