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Houston police knocked on the door of the sister of Dr. Conrad Robert Murray Thursday in Southwest Houston.
Dr. Murray is a cardiologist from Houston with ties to Michael Jackson's death investigation. Murray runs the Home Heart and Vascular Institute in Northwest Houston as well as a clinic in Las Vegas.
Recently, Dr. Murray is said to have been a personal physician to Michael Jackson. The Cardiologist is believed to have been at Jackson's side when 9-1-1 was called to his Los Angeles area home.
Wednesday night, investigators in Los Angeles retrieved a car with Texas plates from Jackson's home.
The plates are registered to a Houston woman, Dr. Murray's sister.
The woman did not appear to be at home when Houston Police arrived.
Police are not considering Dr. Murray a suspect in Jackson's death. They are interested in speaking with the Cardiologist about Jackson's final hours.