Death By Die

('Die', in this case, is a singular dice) Following a poll, I have attempted to write a short murder mystery. It is set in an American casino in the early 1900s, but reflects no particular area. I'll continue it over the next fortnight or so until it's finished. I hope you like it!

The stakes had been high, they'd all known that. But no-one had realized just how high. It had been an average night - I'd been collecting the beer bottles and wiping down the bar... And the men in the far corner were getting more and more agitated. They were certain that one or more members of the group had fixed the roulette. 
There was Jack, who everyone knew was in the black market for medicines; Hank who paid gangs to hold hostages; Brad, the drug dealer; Arnie, who would do anything for a bit of easy cash; and finally Arran, who just liked the thrill of gambling. All five were certain their neighbour was up to something, and were doing their best to find out who.
Finally, the last bet of the night was placed. And Arnie scooped up more than 20 easy dollars. The others were furious; it was their weekly wages collected that Arnie now had. But it wasn't until the following morning when Arnie realised his mistake; his fatal, final mistake.

He was discovered at 7am when I went in to his hotel room, to check he hadn't left any empty glasses lying around. I knocked twice, but with no answer. So I pushed the door open, and saw his body on the bed with two dice in his right hand and a small dark bottle nearby on the floor. I picked up the bottle and sniffed it; it was bitter and sharp. Almost definitely poisoned.