Police ID suspect in Houston cardiologist's murder

Pappas the suspect wanted in the July 20 murder of local cardiologist Mark Hausknecht

Pappas the suspect wanted in the July 20 murder of local cardiologist Mark Hausknecht

Houston Police Chief Art Acevedo described the 65-year-old Pappas as a "very fit, white male" whose chief mode of transportation was a 10-speed Schwinn bicycle. Police said the doctor was likely targeted and implored witnesses to come forward with any information.

"This man is unsafe".

Houston police say a neighbor called the Harris County Precinct 5 Constables' Office to report the sighting, spurring a frenzy of police activity outside the murder suspect's home on Stillbrooke.

"We have plenty of evidence that ties him to this crime", Acevedo said during a news conference Wednesday, adding that evidence was removed from the home that tied Pappas to the crime.

Pappas was not home when officers went there on Wednesday but Mr Acevedo said they found evidence linking Pappas to the killing.

One of the tips was to the fact that the suspect's mother was a patient of the doctor and died during surgery over 20 years ago.

WATCH: Lights can be seen glowing inside Pappas' homeOn Thursday, we learned more details about the murder suspect who is known to be an avid cyclist, just like his alleged victim.

Spencer said another of her daughters knew Pappas was angry with "a doctor" over the death of his mother, but didn't know his name.

"So it appears that this might be a 20-year-old grudge", Acevedo said.

Three days after the July 20 attack on Dr. Mark Hausknecht in Houston, Jeanette Spencer received notification in the mail indicating that the home of family friend Joseph James Pappas had been deeded to her.

Hausknecht's wife, Georgia Hsieh, said police told her that her husband was riding through a building area when the gunman rode up in front of him and fired three shots while facing him.

Police said Pappas and Hausknecht were on their bicycles on July 20 when the suspect rode past the doctor before turning around and fatally shooting him.

A tip on Tuesday led police to suspect Pappas, the chief said, though he didn't elaborate as to the nature of the tip.

Police have also released surveillance photos, taken from a distance, that appear to show the bicyclists crossing paths.

Former president Bush released a statement about Hausknecht's death through his spokesman. "I will always be grateful for his exceptional, compassionate care", the statement read. He said the last anyone had heard from Pappas was in a Tuesday morning text message in which Pappas wrote that he was going to kill himself.

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