Update July 26, 4:45 EDT

There’s a “high probability” a cardiologist who once treated former President George H.W. Bush was targeted when he was fatally shot while riding his bicycle to work, Houston Police tweeted Thursday.

Acevedo revealed the new development in the shooting of Dr. Mark Hausknecht in a tweet on Thursday but did not offer additional information on the investigation.

The suspect was captured on surveillance video moments after the shooting, Houston Police tweeted.

The suspect is the person in the pictures wearing a blue polo shirt and khaki shorts, wearing a backpack.

The victim is shown in the surveillance pictures on the yellow bicycle.

Original story:

A cardiologist who treated former President George H.W. Bush was shot and killed Friday in a bicycle drive-by shooting near Texas Medical Center in Houston.

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Police said Dr. Mark Hausknecht, 65, was riding his bicycle near Texas Children's Pavilion for Women just before 9 a.m. on Friday when he was shot by another bicyclist going in the other direction, Houston Police tweeted.

The man fired two shots at Hausknecht before taking off on his bike, police said.

Hausknecht was on his way to work at the time, KTRK reported. A witness flagged down a private ambulance driving by the scene. Emergency crews rushed him to a nearby hospital, where he later died.

Investigators do not know if the shooting was random or targeted, or possibly the result of road rage.

Jim McGrath, spokesperson for former President H.W. Bush, 94, issued a statement on Twitter.

“Mark was a fantastic cardiologist and a good man,” President Bush said in the statement. “I will always be grateful for his exceptional, compassionate care. His family is in our prayers.”

The suspect in the shooting is still at large, CNN reports. He is described as a 30-year-old white or Hispanic man, wearing a tan baseball cap, grey jacket, khaki shorts and riding a light-colored mountain bicycle.