Link: https://www.abc15.com/news/region-southeast-valley/mesa/mesa-mans-death-in-police-custody-ruled-homicide-medical-examiner-says

The Maricopa County Medical Examiner's Office has ruled the death of 52-year-old Eric Baker, who died after an April arrest by Mesa police, a homicide.

Friendly reminder that the designation of homicide is not itself a statement that a crime occurred. But it's a required step in establishing whether a crime has taken place.

Please explain what a homicide actually is, if not a crime?

When one person kills another person.

Okay, I see - so a homicide might not be a crime in self-defense cases? Is that what we're getting at? Are there other circumstances where it's also not considered a crime?

when it's a cop that did the killing, and that killing doesn't violate a constitutional right that isn't already “clearly established”. such a homicide would fall under qualified immunity.

Accidents would also be a homicide.