Calling 911 is so someone from the city will come and haul away the dead meat. Dead bodies are heavy!
Without giving away too much of the movie.
I like the scene in safe house (1998), guy who played the capt on star trek NG, calls 911, and says, there’s a dead body in my kitchen .
911 wants to know his name, but he just repeats the same thing then hangs up.
Another reason I like this is, I had to call 911 once, then “They” hung up on “me”!