There's no way the UHC CEO was killed by a hitman, although my knowledge of hitmen pretty much extends to only the video game and Calgary variety.
If I'm to believe that someone paid a hitman to kill a CEO on a busy NYC street, with words engraved on the bullet shells, the client would have needed to contact multiple hitmen, with none of them actually being undercover cops, in order to find one wanting to act out a cliché movie plot.
It'd also likely be an extremely expensive job, given the high profile and level of risk. The odds of someone having that money, but being motivated by an insurance denial, seems low.
The way I could see an actual hitman doing a job like that would be with a high-powered rifle from a concealed position. Shooting from a building would make figuring out who to even look for much more difficult, and give plenty of time for an anonymous getaway.
They got footage of this guy at Starbucks beforehand, and escaping on an e-bike into Central Park. Pretty sloppy work.