It was already almost 90 degrees the morning of July 20 as Mark Hausknecht, dressed in blue scrubs, pedaled his bright yellow bike down Main Street toward work at Houston Methodist Hospital, as he did every day.
Hausknecht treated Bush in February 2000 for an irregular heartbeat while the president was visiting Florida. Dr. Mark Hausknecht identified as Houston cardiologist shot to death by gunman on bikeOther photos show the suspect behind the doctor.
Houston police are circulating new photos showing a bicycle rider with a fully loaded backpack who they believe shot and killed a prominent cardiologist.
Hausknecht worked as a cardiologist at Houston Methodist Hospital for many years as part of the DeBakey Heart and Vascular Center.
Investigators described the suspect as a white or Hispanic male, about 30 years old, five-foot-10 with a slender build and clean shaven.
Houston police on Monday continued pursuing several leads in the Friday death of Hausknecht, who once treated former President George H.W. Bush.
"We will all miss seeing Mark in the hallways and seeing patients in the cath lab and [coronary care unit], where he was known as a compassionate physician with a phenomenal bedside manner", Houston Methodist President Dr. Marc Boom said in a written statement.
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"This is a crime that doesn't make sense", Houston Police Chief Art Acevedo said July 21, reported the Houston Chronicle.
On Saturday, police released a sketch of the suspect.
'When students can not go to school without fear, and teachers need to arm themselves, what has this country come to?' she continued.
'So many have asked what can be done to help, ' she wrote.
Hsieh said that as an emergency room doctor, she is "no stranger to the devastating consequences" of gun violence.
Anyone with information about the shooter is urged to contact Houston CrimeStoppers anonymously at 713-222-TIPS.