Makes me think of a scene in this film
https://en.wikipedia.org/wiki/Pain_%26_Gain
based on a real-life incident where people unsuccessfully tried several murder methods simultaneously on a victim but nobody believed the victim's account because the victim was a known medicaid fraudster.
I never heard about the Sun Gym Gang story (https://en.m.wikipedia.org/wiki/Sun_Gym_gang). Crazy stuff!
That movie sounds quite fun! And it's got Tony Shalhoub in, so, sold.
It's one of the blackest black comedies out there except for maybe
https://en.wikipedia.org/wiki/Death_at_a_Funeral_(2010_film)
which puts the "black" into
https://en.wikipedia.org/wiki/Death_at_a_Funeral_(2007_film)