He should get the chair for shooting at a police officer; it doesn’t matter that he grazed him or if he would have missed the cop or killed him.  He shot at a cop and should be put down for it.
It’s a tragedy that a cop died in the line of duty but I think it’s a stretch to hold the criminal responsible for murder in regards to the police officer’s crash.  
Suppose a US Marshal was driving to a prison to transport a criminal from one facility to another and died in a crash.  Should the criminal be charged with murder?  
I see the point, however: criminals create emergencies and emergencies have an element of danger to them.  What’s reasonable though?  If some drunk campers start a fire, the fire department responds, an engine crashes and firefighters die, did the drunk campers commit murder?  If a skier skies out of bounds past warning signs and buries himself in a small avalanche, searchers will respond.  If the searchers die in another avalanche should the out of bounds skier be charged with murder?