Suspect in fatal shooting of former President Bush doctor had ’20 year-old grudge’ sparked by mother’s death

Police have identified a suspect in the fatal shooting of doctor who was once the person physician to President George W. Bush — but the gunman is still at large.

According to the New York Daily News, Police Chief Art Acevedo announced on Wednesday that authorities believe Joseph James Pappas murdered Mark Hausknecht while the doctor was riding his bike in July,

As CrimeOnline previously reported, the doctor and the suspect were both riding bikes at the time of the fatal shooting. Hausknecht, a cardiologist, was reportedly riding near the Texas Children’s Hospital when he crossed paths with the gunman on a bike. He was pronounced dead shortly after he was shot.

At the time, authorities were not certain if the shooting was a random attack, but now believe Dr. Hausknecht was targeted by the son of a former patient – who died 20 years ago.

Hausknecht was reportedly treating Pappas’s mother when she died during heart surgery two decades ago. Apparently, Pappas felt the cardiologist was responsible.

On Wednesday, police issued a warrant for the suspect’s arrest.

“It appears a 20-year-old grudge and sadly someone died,” Acevedo told reporters, according to CNN.

Police reportedly received a tip from someone who said they recognized Pappas in the surveillance video taken near the site of the shooting.

But when authorities tried to apprehend Pappas, 62, he was not at home and they have not been able to locate him. Investigators reportedly found evidence at the home that appears to link him to the doctor’s killing.

The suspect is considered armed and dangerous, and reportedly made phone calls in which he discussed committing suicide.

“This man is dangerous. This man is capable. This man has some skills (with firearms),” Acevedo told reporters.