Andy Stone, killed by the two hitmen while leaving the steak house

ACE: As far as the world was concerned, Andy Stone, the head of the Teamsters' Pension Fund, was a legitimate guy.
NICKY: As much as they liked him, I mean, he wasn't one of us. He wasn't Italian. As far as they knew, he could have talked. Otherwise, Stony might still be alive.
John Nance, killed in his mansion in Costa Rica

NICKY: The guys inside the counting room were all slipped in there to skim the joint dry. They'd do short counts, they'd lose fill slips. They'd even take cash right out of the drop boxes. And it was up to this guy right here, standing in front of about two million dollars, to skim the cash off the top without anybody getting wise, the IRS or anybody.
Nance is the money courier who brings the cash to the bosses in Kansas City.
NICKY: The first one to skip was John Nance. He found a nice, warm secluded place in Costa Rica. He thought nobody would find him there. But, then, his kid got nabbed by the Feds for drugs, and so naturally the bosses were afraid he'd come out of hiding just to save his kid and give 'em all up.
Two Counters, killed by the two hitmen in the desert
The Count Room executive

The Counter #2

They were both well aware of the scheme, as Nicky says:
NICKY: The guys inside the counting room were all slipped in there to skim the joint dry. They'd do short counts, they'd lose fill slips. They'd even take cash right out of the drop boxes.
Richie, killed in his car

He is a Tangiers Executive also aware of the scheme like the other guys.
Script