Murder of well-known Houston cardiologist remains a mystery

Dr. Mark Hausknecht, a prominent cardiologist who treated former President George H.W. Bush, was gunned down while on his way to work on his bicycle; Houston police are investigating.
1:24 | 07/21/18

Coming up in the next {{countdown}} {{countdownlbl}}

Coming up next:

{{nextVideo.title}}

{{nextVideo.description}}

Skip to this video now

Now Playing:

{{currentVideo.title}}

Comments
Related Extras
Related Videos
Video Transcript
Transcript for Murder of well-known Houston cardiologist remains a mystery
Llowing a Mae bombardment. That shaking cease-fire, seems both Egypt and U.N. Officials. Back here in the states, to a ling murdemystery. A well-known cardiologiso trted formerresident grge H.W. Bush. Gunnedn on his Y to work. Here ABC's Marci Gonzalez. Reporter: Tonight, Houston police scouring for evidence trying to figure out who killed this prominent cardiolt he rode his bike to work. Targeted? I just know hoible. Reporter: He once treated president George H.W. Bush, inexplicably gunned down on this strjust before 9: Friday moing. The suspect was on a bicycle as well. Dre past, rode past the doctor, turned and fired two shot the doctor immediately went down. Reporter: The gunman wearing a ll cap, sunglasses, gray jacket and khaki shorts. Rding off. As witnesses Flagg down a passing amlance. We sed and rendered aid to the best of O ability. The 65-year-old doctor pronedhe hospital in the same Mel where heated parties for nearly four decades. The formersident calng him ntastic cardiologist and good man. Tonight, this former patient puttin a merial in trib tonight, the motive is still unclear. Police are hoping surveillance vid witnesses could help lead them tor. T HT, Marci, T you. Next to the search for

This transcript has been automatically generated and may not be 100% accurate.

{"id":56737875,"title":"Murder of well-known Houston cardiologist remains a mystery","duration":"1:24","description":"Dr. Mark Hausknecht, a prominent cardiologist who treated former President George H.W. Bush, was gunned down while on his way to work on his bicycle; Houston police are investigating.","url":"/WNT/video/murder-houston-cardiologist-remains-mystery-56737875","section":"WNT","mediaType":"default"}