If a homeowner shoots and kills an intruder, the Coroner will rule it as a homicide, even if it justifiable. Almost everyday, citizens or sworn officers are shooting and killing someone who is committing a felony. In each case, the Coroner will rule it as a homicide.
Of course now, some will read this and accuse me of defending the actions of the officers in this incident. I am not.
The fact is when a ruling of homicide is given that means somebody killed the victim, whether it was justified or not, natural deaths are not ruled homicides. Since this could hardly be called justifiable homicide(or are you saying these cops were in the right to kill this old man?)then it must be murder or man slaughter at the very least