Detectives searched the Houston, Texas, medical office of Dr. Conrad Murray on Wednesday for “evidence of the offense of manslaughter,” Murray’s lawyer said. The physician was with Michael Jackson when the pop star was stricken at home last month.

Acting on a search warrant, a caravan of 15 cars descended on the clinic at about 10:20 a.m. Wednesday. Agents are focusing the investigation on the drug Propofol, the powerful anesthesia that Jackson may have taken before his death. During the raid, Murray was in Nevada, where he has another office. The doctor has already been interviewed twice by police and has denied wrongdoing. Los Angeles detectives are seeking a third interview and have asked for medical records in addition to those Murray has already provided.

Murray was the doctor with Jackson at his home when the pop star died June 25. A spokesman for Murray’s lawyer confirmed the search. He said they were “caught off guard by this,” but they are cooperating with investigators. “Anything they are asking for, we will give them,” the spokesman said.

Murray’s lawyer, Edward Chernoff, said in a statement: “The coroner wants to clear up the cause of death – we share that goal. Based on Dr Murray’s minute-by-minute and item-by-item description of Michael Jackson’s last days, he should not be a target of criminal charges.”

According to his attorney, Murray is “frustrated by negative and often erroneous media reports, he has to walk around 24-7 with a bodyguard. He can’t operate his practice. He can’t go to work because he is harassed no matter where he goes.”

Although Chernoff has said the doctor DID NOT give the pop star any drugs that contributed to his death, he refused to comment on claims the cardiologist administered Propofol. He said: “Dr Murray was the last doctor standing when Michael Jackson died and it seems all the fury is directed toward him.