Marty, Chris, and George are playing poker one night together. During the game they begin discussing each of their respective financial problems. After a long night of drinking, they all decide they are going to rob a bank together and split the profits of their ill-gotten gains to get out of debt. Chris owns a windowless van and provides it for the heist. Chris also decides to drive the van because he does not fully trust his friends not to wreck it. George, an avid owner of firearms and ammunition, supplies himself, Marty and Chris with guns for the heist. Marty works as a teller at the Last National Bank in town, and notifies his friends that the armored car shows up daily at 4:30 pm to pick up all the excess cash deposits for the day. The rest of the cash deposits are held in the bank vault. The following Friday, Marty calls in sick to work, and all three of them show up to the bank at 4pm in Chris's van with George's guns in hand. George and Marty walk into the bank and demand all the cash from the teller's cash drawers, and George goes back with the bank president to clean out the vault. Chris stays in the van and idles waiting for his friends to come out with bags of cash. While Marty is holding the rest of the bank at gunpoint, an on-duty police officer in uniform comes into the bank to make a deposit, sees the robbery in progress and attempts to arrest Marty. Marty sees the officer and shoots him in cold blood, killing him. All three are apprehended and arrested for robbery and capital murder. Under the laws of the state Marty, Chris and George live in, a murder becomes Capital Murder when a person intentionally kills another in the commission of a robbery, or if they intentionally kill a person the defendant knows is a peace officer executing a lawful duty. Under what theory would Marty, Chris and George be rightfully convicted of capital murder? Explain.