Jackson's Investigation Focusing on Manslaughter

Authorities are investigating whether Michael Jackson's death was a case of manslaughter, according to a search warrant served on the offices of the entertainer's doctor.

The search of Dr. Conrad Murray's clinic in Houston was conducted Wednesday morning by agents from the Drug Enforcement Administration, two detectives from the LAPD's Robbery Homicide division and officers from the Houston Police Department, according to Murray's attorney.

"We reviewed the warrant and remained on the premises while the search was being executed," says Murray's lawyer Ed Chernoff in a statement. "The search warrant authorized law enforcement to search for and seize items, including documents, they believed constituted evidence of the offense of manslaughter."

Among the items taken were a "forensic image of a business computer hard drive" and 21 documents. "None of the documents taken had previously been requested by law enforcement or the L.A. Coroner's office," says Chernoff.

Murray, who was with Jackson when he was stricken last month at home, has denied any wrongdoing and has said he's cooperating with authorities.

As part of the investigation, the L.A. coroner also has subpoenaed Jackson's medical records from his former nutritionist, Cherilyn Lee, who worked with him from January to April this year, according to Lee's rep, Belinda Foster. Authorities interviewed Lee on Wednesday about conversations she had with Jackson.