Houston police hunt clues in killing of Bush doctor by bicyclist

Houston police are studying surveillance video and following up on tips in the killing of a cardiologist who once treated former U.S. President George H.W. Bush and was fatally shot while riding a bicycle in the city's medical center, authorities said on Saturday. Mark Hausknecht, 65, was killed on Friday morning by a man thought to be in his 30s who fired at least two shots at him from a passing bicycle as the doctor rode to work at the center, which is home to several hospitals and medical offices, police said. "Mark was a fantastic cardiologist and a good man.

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