It looks like the hawk died a few days ago. It appears something decapitated it after it was already dead (the head is about a foot away). The hawk does not appear to have been eaten by other animals.
Since it is very unusual to find a dead hawk in the neighborhood, I submitted a report to the State's Dead Bird Hotline for West Nile Virus, now online. They are not currently picking up dead birds in our area so per their advice I also submitted a request to the City's MyLA311 app for dead animal pick up. (Not counting on that to happen - so keep your dogs on a leash.) Maybe one of the migrating Turkey Vultures will take care of it.
According to the State's FAQ on West Nile Virus, you cannot catch West Nile Virus from contact with a dead animal, only from the bite of an infected mosquito.
Without a necropsy there is no way to tell what killed the hawk. Considering we once rescued a Red Tailed Hawk that had been shot with a gun, you just don't know.
