Paul Gray, bassist for heavy metal band Slipknot, was found dead Monday morning in an Iowa hotel. Foul play has been ruled out, but no cause of death has been determined. Toxicology tests will be done on Tuesday. Paul had just joined the metal revival supergroup Hail!, and his wife Brenna is pregnant with the couple's first child. Gray had done one stint in rehab, and in interviews talked at length about his struggles with drug addiction and abuse.