Very Bad Things (movie, 1998)

Kyle Fisher has one last night to celebrate life as a single man before marrying Laura, so he sets out to Vegas with four of his best buddies. But a drug and alcohol filled night on the town with a stripper who goes all the way, turns into a cold night in the desert with shovels when the stripper goes all the way into a body bag after dying in their bathroom. And that's just the first of the bodies to pile up before Kyle can walk down the aisle...