There’s no way whoever ordered the hit the first time (assuming it really was an ordered hit … and it probably was) individually is going to want that heat.
It’s one of those things that “if one of your acquaintances dies, it’s plausible it really was an accident like you said. If people who hangout with you keep dropping … a lot more eyes are looking at you.”
It’s probably not a true “company” position to murder whistle blowers, but somebody presumably thought it was in their own best interest.