The felony murder rule is, I believe, on a state-by-state basis. And it doesn't just say that one person is the presence of a murder, it says that both people were in the act of committing a felony (any felony) when the murder occurred. This keeps people from being charged with murder merely because a friend or family member kills someone while they're there. Here's a more succinct summary than I can provide:
Felony murder rule - Wikipedia
I've been involved in a couple of felony murder rule cases. One involved two men sent to "ask" a woman for the return of a ring, in which one of the men took a weapon and a guard on the property of the woman ended up dead. Man #2 ( who didn't have a weapon) tried to claim he only thought they were there to "ask" for the ring, but Man #1 had bolt cutters and had cut through a fence (charged with felony breaking and entering - so now, both were charged with murder; Man #2 was successful in turning state's witness and getting a reduced charge with no murder conviction . BTW, the bolt cutters were used to retrieve the ring and the guard was killed when he was pushed into a concrete culvert. The court ruled that the subsequent felony (cutting off the woman's finger to get the ring) was enough to hold both of them responsible for the death of the guard but Man #2 plead out.
The other case was pretty well-publicized, in which a defendant was the getaway car driver after a fight broke out at a party (to which no one in the defendant's group was explicitly invited). One person died as a result of a blow thrown by a member of the defendant's group. Puncher was eventually convicted of 2nd degree murder (along with everyone else in that group). The qualifying felonies in that case included assault and battery (even though only one person in the group was proved to have thrown punches). The prosecution successfully argued that the group went to the party looking to assault and batter. A felony trespass charge was dropped (that was the part I worked on).
Italy also has the felony murder rule, and in this case, there were at least two felonies in which it looks like both men participated: the drug deal and then the theft of the backpack. Resisting arrest may also be a significant charge in Italy. So yeah, the second man can be charged and possibly found guilty of murder.
I think he will be charged that way, and I wouldn't be surprised if he's found guilty.
Thank you for explaining that in detail!
The suspect's families seem to be splitting hairs with Gabriel's family claiming that he is innocent because he didn't know that they killed an officer, and Finnegan's family claiming that the carabinieri eye witness doesn't know what he's talking about.
I'm convinced that they are in this for years whether they like it or not. Their lives are forever altered and no amount of money will solve the situation. The widow already has a lawyer, so all decisions will have input from the prosecution, the victim, and the defense. Denial will only make things worse.