A tenant in the apartment building where Castle lived for a time under the name of John Smith. Grossly overweight and requiring Castle's help to get through the door of his apartment, Mr. Bumpo once suffered a heart attack and the paramedics had to destroy part of the building's wall and use a crane to take him to the hospital. Shortly after he was released, the Russian attacked Castle at his home. After a vicious fight, Castle used Bumpo to smother him, doing so for thirty minutes.Castle later left him a share of Gnucci's money, and was said by Joan to be living in a clinic in Albany after "something important fell out of his bottom."
Mr. Bumpo was played by John Pinette in the 2004 The Punisher movie. In the movie Mr. Bumpo is not pushed on top of the Russian killing him like in the Welcome Back Frank story arc.