UPDATE #6: Additional surveillance video released of the suspect in an area neighborhood immediately following the doctor's shooting. No other details at this time. Anyone w/ information urged to contact HPD Homicide at 713-308-3600 or @CrimeStopHOU at 713-222-TIPS. #hounews pic.twitter.com/nWp9EyRQlk — Houston Police (@houstonpolice) July 30, 2018 EMBED >More News Videos A newly released surveillance video shows the moments before a Houston cardiologist was killed. EMBED >More News Videos HPD releases new video of suspect in doctor's fatal shooting. HOUSTON, Texas (KTRK) -- Police have just released additional surveillance video in connection with the murder of a prominent Houston doctor.Dr. Mark Hausknecht was gunned down as he rode his bicycle to work in the Texas Medical Center about a week and a half ago.On Monday, Houston police tweeted out video of the suspect in a nearby neighborhood immediately following the doctor's shooting.ABC13 showed the images of the bike to the owner of Bike Barn, who said while the bike is somewhat common, there are some distinguishing factors. "It looks like it's something that's either late 80's or early 90's based on the curvature of the fork, which basically attaches the front wheel of the bike to the frame of the bicycle," said Kenton Luff.Police are still hoping to find more video of the suspect. If you were in the area on the morning of July 20th, investigators are asking that you check your dash cams.Neighbors are pitching in to help find Dr. Hausknecht's killer. Colman Ryan lives in the area and had signs made. "What I'm doing is, I'm going to intersections where panhandlers hang out, they're going to be there anyway, so I give them a bottle of Gatorade, a couple of bucks and ask them to display this," said Ryan.On one side of the sign, it shows a surveillance image of the suspect with a written description of him. On the other side you see the composite sketch.Ryan doesn't know the doctor but he wanted to help. "When I saw it on ABC13, I thought what could I do? So, I came up with this idea," said Ryan.Anyone with information in the killing is urged to contact the Houston Police Department Homicide Unit at 713-308-3600, or Crime Stoppers at 713-222-TIPS.<doc-sep>The suspect's mother died during surgery by the cardiologist, police say Houston police believe that the suspect who allegedly killed the one-time doctor of former President George H.W. Bush held a 20-year grudge against the cardiologist because his mother died while being operated on by the doctor. Authorities have filed an arrest warrant for Joseph James Pappas, 62, who is believed to be armed and dangerous as well as suicidal, said Houston Police Chief Art Acevedo during a press conference Wednesday. The arrest warrant carries a charge of murder, Acevedo said. Mark Hausknecht, 65, was shot on July 20 as he rode his bicycle in broad daylight in a residential neighborhood in Houston. Officers searched Pappas' home early Wednesday morning and received a tip from an individual who had information about the killing, Acevedo said. "We believe this absolutely is the killer of Dr. Hausknecht," Acevedo said. Acevedo praised members of the community for coming forward after the latest footage was released on Monday with a clearer image of the suspect. "Good job," he said. "Thank you for all your work. You did your part." That footage was obtained from home surveillance, and the police department received several tips from people who recognized the man. One of the callers indicated that the suspect's mother was once a patient of Hausknecht's. Those close to Pappas have not heard from him in about 36 to 48 hours, Acevedo said, adding that the suspect allegedly sent a text to someone indicating "that he was going to kill himself." Acevedo asked anyone aware of Pappas' whereabouts to call 911. The police chief described Pappas as a "very fit white male" and said it's "highly likely that he left his residence on a bicycle," a 10-speed Schwinn model. After Hausknecht was killed, police announced that he likely "targeted," when he was shot by the gunman, who was also on a bicycle when he rode past Hausknecht before turning and firing two shots at him. Hausknecht was heading to work when he was shot, the president and CEO of Houston Methodist Hospital, Marc L. Boom, wrote on the hospital's website. "He was a brilliant physician, and he's touched a lot of lives," Acevedo said on Wednesday. A sketch of the suspect was released a day after Hausknecht was killed. The man was wearing a dark jacket when he fled the scene. Police released surveillance video and images from the scene, which show the gunman behind him just before the shooting. ABC News' Enjoli Francis, Bill Hutchinson and Meghan Keneally contributed to this report.<doc-sep>Former President George Bush, center, waves as he leaves with cardiologist Mark Hausknecht, left, and Bush's family doctor Ben Orman, right, after a news conference at Methodist Hospital Friday, Feb. 25, 2000 in Houston. Bush spent Thursday night in a Florida hospital and was released Friday after being treated for atrial fibrillation. He returned to Houston Friday and was admitted to Methodist Hospital for further tests. (AP Photo/David J. Phillip) Houston Police released new video of the man who they believe shot and killed prominent cardiologist Dr. Mark Hausknecht in broad daylight on June 20. In the video, taken from a residential surveillance system, the suspect is seen riding a bicycle through a nearby neighborhood "immediately following the doctor's shooting," according to Houston PD. The footage is from the same Houston street where neighbors were going door to door asking others to scrub through surveillance footage looking for images of the suspect. Houston Police released a photo of Joseph James Pappas, 65, who is a suspect in the murder of Dr. Mark Hausknecht (CNN) — “He was very gentle, he was very caring, he offered a lot to people in need,” Dr. Neal Kleiman said. “That was his personality, and that was his family’s personality, too.” Pappas, 62, planned Dr. Mark Hausknecht’s killing – apparently over his mother’s death – and last month followed the doctor as he rode his bicycle to work at Houston Methodist Hospital, according to authorities. Both men were on their bikes on July 20 when Pappas rode past Hausknecht before turning around and fatally shooting him, police said. The prominent surgeon and former cardiologist for President George H.W. Bush was found near a construction site with hundreds of workers, but the equipment was loud enough to mask the sounds of gunfire. “It appears that this may be a 20-year-old grudge that this man held,” Police Chief Art Acevedo said Wednesday. “There was a lot of planning that went into this. There was a lot of planning and sadly some skill.” Police issued an arrest warrant for Pappas after they searched his home and did not find him. The suspect has multiple firearms and has made phone calls indicating he was considering suicide, Acevedo said. “This man is dangerous, this man is capable, this man has some skills (with firearms),” he said. 02:16 - Source: CNN Police: Houston cardiologist likely targeted Hausknecht’s family released a statement Thursday thanking Houston police and others who helped identify a suspect, and asking the public to focus on Pappas’ photo and contact police if they know where he is. Surveillance video helped identify him In the days following the shooting, the motive and the suspect’s identity remained a mystery. Police said the doctor was likely targeted and implored witnesses to come forward with any information. Houston Police Dept Houston Police released a photo of Joseph James Pappas, who is a suspect in the death of Dr. Mark Hausknecht. Stunned friends and neighbors canvassed the area where police believe the gunman may have fled. They encouraged residents to look through their security camera footage for images of the suspect. Surveillance video obtained by a neighbor allowed investigators to enhance the suspect’s photo, which helped identify him, police said. On Tuesday, someone said they recognized the suspect in surveillance video released a day before. When police searched Pappas’ home, “we found plenty of evidence that … showed an extreme interest by (Pappas) in the doctor,” Acevedo told CNN on Thursday. “If you think about his fascination with the doctor and the fact that he ends up killing this man in cold blood, the only thing we can think of is the connection between his mother dying over 20 years ago during surgery,” Acevedo said. “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.” Suspect’s number is linked to firearms website Acevedo said there’s other evidence that leads them to believe Pappas is the shooter, but did not provide additional details. Other surveillance images showed the suspected gunman just behind Hausknecht as both headed north on a street, police said. Police posted images on Twitter in which Hausknecht is highlighted with a green circle and the suspect with a red circle. CNN called a phone number listed for Pappas’ real estate company Wednesday, but the call went to voice mail. That phone number is linked to recent listings on a firearms auction website for several guns, ammunition, tactical vests and ballistic plates for car doors. The posts, from a user in Houston, apparently went online days after the shooting. It is unclear whether any of the firearms listed online were used in the shooting. A spokesman for Houston police declined to comment on the ads. Suspect worked as a constable for decades Pappas worked for 30 years as a constable, according to Texas Commission on Law Enforcement records. He worked for Harris County as a peace officer and a reserve officer from May 1983 to July 2013. Pappas took law enforcement classes through August last year, and appeared to own multiple guns, police said. Doctor remembered as quiet and friendly Hausknecht and his wife, Georgia Hsieh, lived in an upscale neighborhood not far from the Texas Medical Center in southwest Houston. In addition to his wife, who is a retired emergency room physician, Hausknecht is survived by two adult sons, Matthew and Paul. Friends and colleagues remembered him as a quiet, generous and kind person. “The man who healed so many hearts during his life, has left so many broken by his death,” a Houston Chronicle obituary read. CNN’s Jamiel Lynch and Sonia Moghe contributed to this report.<doc-sep>HOUSTON — The suspect in the killing of a cardiologist who once treated President George H.W. Bush apparently had a grudge over the death of his mother during surgery by the doctor 20 years ago, Houston police said Wednesday. Dr. Mark Hausknecht was gunned down July 20 while riding his bike to work at Texas Medical Center. Authorities said the shooter rode past Hausknecht before turning around and firing. The suspect was identified as Joseph James Pappas of Houston, who was described as armed, dangerous and possibly suicidal. Neighbors had not seen Pappas in about two days and had sent a text Tuesday morning indicating that he was going to kill himself, police said. 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. ► July 20:Bush’s former doctor shot and killed while riding bike in Houston He also said there were indications that Pappas might have worked as a constable many years ago and was familiar with the handling of firearms. "There was a lot of planning that went into this, and sadly, some skill," Acevedo told reporters. Police were led to Pappas through a tip from someone who had seen surveillance video of the suspect. Acevedo praised the community, which includes a heavy Hispanic population, for coming forward to cooperate with police. On Tuesday, police released another video from a home-security camera that showed the suspect riding his bike in a nearby neighborhood minutes after Hausknecht was shot. The suspect was carrying a green backpack that investigators believe concealed the gun. Hausknecht, who was buried Saturday, treated Bush in 2000 for an irregular heartbeat after the ex-president complained about lightheadedness. Contributing: KHOU-TV, Houston. Follow Doug Stanglin, who reported from Virginia, on Twitter: @dstanglin<doc-sep>
UPDATE #6: Additional surveillance video released of the suspect in an area neighborhood immediately following the doctor's shooting. No other details at this time. Anyone w/ information urged to contact HPD Homicide at 713-308-3600 or @CrimeStopHOU at 713-222-TIPS. #hounews pic.twitter.com/nWp9EyRQlk — Houston Police (@houstonpolice) July 30, 2018 EMBED >More News Videos Houston police release new surveillance video of suspect in doctor's murder EMBED >More News Videos A newly released surveillance video shows the moments before a Houston cardiologist was killed. EMBED >More News Videos HPD releases new video of suspect in doctor's fatal shooting. HOUSTON -- A man suspected of killing one of former President George H.W. Bush's doctors may have been seeking revenge for his mother, who died on the doctor's operating table more than 20 years ago, authorities said Wednesday.Joseph James Pappas, 62, should be considered armed, dangerous and possibly suicidal, Houston police Chief Art Acevedo said at a news conference Wednesday afternoon. "There was a lot of planning that went into this. There was a lot of planning and, sadly, some skill," Acevedo said of the July 20 attack on Dr. Mark Hausknecht. Hausknecht was gunned down while riding his bike to work at Houston Methodist Hospital, which is part of the busy Texas Medical Center. Authorities say the shooter rode past Hausknecht before turning around and firing.A tip on Tuesday led police to suspect Pappas, the chief said, though he didn't elaborate as to the nature of the tip.Acevedo said Pappas hadn't been seen in 36 to 48 hours. 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.Acevedo said police searched his home at 4 a.m. Wednesday and found evidence that ties Pappas to the killing, but he declined to elaborate as to the nature of the evidence.The chief said Pappas is very fit, and that he's likely getting around on his 10-speed bicycle, which he rides "extensively and almost exclusively. "Friends and family have described Hausknecht as a humble and generous man who was adored by his patients, volunteered in his community and cared about the environment.Hausknecht was also an avid cyclist and rode his bike to work each morning, as he lived less than 2 miles (3.2 kilometers) from his office.In 2000, Hausknecht treated Bush for an irregular heartbeat after the ex-president complained about lightheadedness.Neighbor Jim Herd said he has known Pappas all of his life, having attended the same high school and church as him.Herd described Pappas as a nice, quiet man who kept to himself and had few close friends. "He was a loner," he said.Pappas' house, in which no one was found Wednesday, is in an older, established neighborhood in southwest Houston. Most of the homes are single-story ranch homes with neatly manicured lawns.Indeed, Pappas kept a neat yard, Herd said, and he saw Pappas mowing his lawn a week after the doctor was slain.The house was home to Pappas's parents and their family from the time Pappas was born, Herd said, adding that Pappas inherited the house after his father's death about 10 years ago. Since then, Pappas had lived there alone.Herd said he and Pappas had few words but would wave at each other in passing - the last time on Saturday, when Pappas waved at him as Herd washed his car in his driveway.Herd said he does not remember ever hearing Pappas speak bitterly about his mother's death or place blame for it. But "it hit him hard," he said, and Pappas stopped attending church for a long time afterward.After police released photos from surveillance video of the suspect in Hausknecht's slaying, Herd said he thought it resembled Pappas but brushed the notion aside. "Never in a million years would I have thought it was him," he said.-----