With felony murder, you have two things going on at one time. There is some sort of criminal activity that is taking place, and a murder is also taking place at the same time. There are some jurisdictions that call this first-degree murder. Felony murder could be the end result of a bank robbery, or a case of arson, even if the person who was committing the robbery or arson had no idea he was harming another human being. There is a felony murder rule, which states that a case of manslaughter will automatically become a case of this type of murder when someone is accidently killed as a result of the felony. This rule also states that the felon is responsible for every death that took place, be it one or twenty.