I need help belt noise, and something seized!!!

[coon5555]

i have a 2002 X5 4.4l with 55000 miles.

I get a call from the wife and she said the car went dead while going down the road. She said it made a bad noise before it went dead. She tried to start the car and the noise continued. She shut off the car and so nice peolpe helped her push it into a parking lot. The car was 1/2 mile from the house. I get off work and go see if i can get it home. It was dark by the time I made it there. I checked the fluids, looked for leaks and the obvious stuff. Started it up and sounded like one of the pulleys was seized. I shut if off and waited until today to try to figure out what the problem was.

I get it towed home. I read several threads last night and I was almost certain it was a water pump, or the alternator. i get everything tore apart and I start to remove the serpentine belt. I notice the power steering pump pulley looks like it is sticking out on the bottom. I thought it was just how I was looking at it. I turned all the pulleys and nothing is binding so I crawl up under to take a closer look at the power steering pump and part of the housing is cracked!

Does anybody know what could cause this?