Michael Jackson’s doctor is being investigated for manslaughter.

Dr. Conrad Murray – who was with the 50-year-old pop icon when he died of a suspected cardiac arrest last month – was formally named in court papers filed in Houston Thursday.

On Wednesday, police and agents from the DEA raided Murray’s Houston offices looking for “items constituting evidence of the offense of manslaughter.”

Citing a receipt for the search warrant, The Associated Press listed that items seized by investigators include: “two computer hard drives, a Medical Board certificate, letters to a former employee, a list of contacts and papers pertaining to his practice. Among those is a ‘suspension notice from Doctor’s Hospital’ and ‘papers regarding incomplete chart at Doctor’s Hospital.’”