At 11:00 p.m., John and Marsha were accosted in the entrance to their apartment building by Dirk, who was armed as well as masked. Dirk ordered the couple to take him into their apartment. After they entered the apartment, Dirk forced Marsha to bind and gag her husband John and then to open a safe which contained a diamond necklace. Dirk then tied her up and fled with the necklace. He was apprehended by apartment building security guards. Before the guards could return to the apartment, but after Dirk was arrested, John, straining to free himself, suffered a massive heart attack and died. Dirk is guilty of 
burglary, robbery, and murder.  robbery and murder only. burglary and robbery only. robbery only.