If a person is killed during the commission of a felony, they face murder charges. Not sure if it's like that in every state but every one I'm familiar with. Had they not decided to commit the felony burglary, nobody would have been killed. He was killed due to THEIR actions, not the homeowner defending himself and his property.
OK I just didn't know. I do like it, murder carries a much stiffer penalty than burglary. I say get whatever you can to put them away for the longest time. This is why I am NOT a lawyer!