Houston police chief Art Acevedo said Wednesday that a cardiologist who previously treated former President George H.W. Bush was likely targeted when he was fatally shot last week.

Acevedo said he believes police will be able to find the suspect in the fatal shooting of Mark Hausknecht because of several nearby witnesses at the time of the incident, CNN reported.

Police said that Hausknecht was shot and killed by a fellow bicyclist last Friday as the cardiologist rode his bicycle to work. The suspected gunman is still at large.

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Witnesses described the suspect as a 5’10” white or Hispanic man, about 30 years old and having a slender build.

Police released an artist’s sketch and images from surveillance cameras earlier this week, according to CNN.

Hausknecht, 65, had previously treated Bush. The cardiologist worked at Houston Methodist Hospital.

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