[PHOTOS: Fans mourn Michael Jackson's passing]
[PHOTOS: Michael Jackson through the years]
[VIDEO: Full video coverage of the passing of Michael Jackson]
[INTERACTIVE: The many faces of Michael Jackson]
[INTERACTIVE: Timeline of Michael Jackson's career]
[INTERACTIVE: Michael Jackson's 18 #1 hits]
[QUOTES: Read what friends and colleagues are saying about MJ]
We spoke with an employee at a Houston clinic out of which Murray has worked. According to that employee, Dr. Murray had been spotted there on several occasions. While she wouldn't tell us her name, the woman inside the Armstrong Medical Clinic did confirm to us that Dr. Murray dropped in from time to time.
"When you've been here, has he seen patients here?" we asked her.
"He's a cardiologist," she answered.
"Who works out of here sometimes?"
"Sometimes," she answered.
Earlier Friday morning, Los Angeles police towed a silver BMW with Texas license plates from Jackson's rented Los Angeles area home. They believe it may contain evidence crucial to the investigation.
While police confirmed that the car belongs to Dr. Murray, the plates came back to his sister who lives at a townhome in southwest Houston. We knocked on the door there, but no one answered. But we did talk to her next door neighbor.
"She's quiet and that's about it," said that neighbor. "We only see each other when she's coming in or I'm going out or something."
Los Angeles police say they want to speak to Dr. Murray in hopes that he can shed light on how the pop star died. They stressed he was not under criminal investigation.
We have learned that Dr. Murray has connections with four clinics and one pharmacy in Houston.
As for Dr. Murray's sister, we're told that Houston police were also at her home Friday afternoon. It was a welfare check, at the request of the Los Angeles Police Department. The sister was apparently home, but didn't answer her door.
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