News of his death made national headlines and prompted heartfelt responses from the medical community, other local hospitals and former U.S. President George H.W. Bush, the doctor's former patient.
Police warned earlier this week that Pappas should be considered armed and risky, and said that he had reportedly spoken of suicide during phone calls with unknown individuals.
'There was a lot of planning that went into this.
According to the chief, a city parks board employee who'd been checking for graffiti in the area near the Jewish Community Center came across a man in the area not far from Pappas's home in Westbury and approached him. "You don't normally put on a bulletproof vest" when you're thinking of killing yourself, the police chief told reporters. Houston police released photos of Pappas Wednesday hoping for a tip on his location. They encouraged residents to look through their security camera footage for images of the suspect.
Earlier this week, with the help of that footage, police named Pappas as the suspect. Acevedo couldn't say whether it could be characterized as a "hit list", but said the employees were notified.
During a search of Pappas' home, officers discovered "a very extensive intelligence file" on Dr Hausknecht.
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Police believe Pappas' motive was a more than two-decade grudge against the interventional cardiologist, after his mother died during surgery in 1997. "Until we talk to him, we can't say definitively that that's the motivation behind this killing, but there's nothing else that would explain it". 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.
It is unclear whether any of the firearms listed online were used in the shooting. Records show Pappas has an extensive background in law enforcement- serving more than 30 years as a deputy constable in Harris County.
Pappas had worked from 1983 through 1995 as a peace officer with two Houston-area constable offices.
When a second officer arrived, Pappas pulled out a revolver with his right hand and shot himself.
The chief said Dr. Hausknecht may not have been Pappas' only target.
Hausknecht, who graduated from Baylor College of Medicine and then attended Johns Hopkins Hospital for his residency, was an internationally respected cardiologist.
"The man who healed so many hearts during his life, has left so many broken by his death", a Houston Chronicle obituary read.