He'd just had his wheel bearing replaced. I'm more inclined to think either the shop over torqued the bolt or that axle was just defective. On the other wheel bearing comments, I agree 100%.
Integra's aren't prone to wheel bearing problems like our subaru's. Honda had a problem in the early 90's like the subaru's and they re-engineered and fixed it. They use to have problems with wheel bearings and cracked hubs.