Detailed Instructions: In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.
Problem:EMBED More News Videos Former patient remembers doctor shot to death by gunman on bike 
  
 UPDATE #4 New surveillance photo of the suspect wanted in the killing of Dr. Hausknecht. Suspect is now described as wearing a blue, short sleeved polo shirt, (not a gray warm-up suit), a khaki ball cap and khaki shorts. He has a large, fully-loaded, olive green backpack. pic.twitter.com/VRk66CFeXb — Houston Police (@houstonpolice) July 23, 2018 
  
 EMBED More News Videos Houston police release new photos in death of doctor 
  
 EMBED More News Videos Friends remember prominent Houston doctor at vigil. 
  
 EMBED More News Videos Sketch released of suspect wanted in death of prominent doctor in Houston. 
  
 UPDATE#3: Road traveled: These still photos show Dr. Hausknecht (in green) & the suspect (in red). The Dr. is headed north at 6700 Main & crossing into the W Holcombe Blvd intersect. 2nd & 3rd photos are suspect behind the Dr. The shooting happened moments later, one block away. pic.twitter.com/d56PDIu4Ah — Houston Police (@houstonpolice) July 23, 2018 
  
 Houston police are circulating new photos showing a bicycle rider with a fully loaded backpack who they believe shot and killed a prominent cardiologist.Throughout Monday, authorities began showing surveillance images of Dr. Mark Hausknecht and the suspect in his murder. Hausknecht, who was also on a bicycle at the time, was shot on his way to work last Friday morning.The doctor can be seen heading north at 6700 Main and crossing into the West Holcombe Boulevard intersection.Other photos show the suspect behind the doctor. The shooting happened moments later, one block away.Later Monday afternoon, new photos taken from a dashcam camera were released showing a clearer look of the suspect.Police said the suspect was wearing a blue short-sleeved polo shirt, a khaki ball cap, and khaki shorts. The backpack he was carrying was a large, fully loaded, olive green backpack.So far, no arrests have been made, and police are searching for leads into Hausknecht's death.Hausknecht was a private doctor who worked at Methodist Hospital and Memorial Hermann Hospital.On Sunday, friends of Hausknecht remembered the prominent doctor."He just played a very great role in the community," a woman said.Hausknecht's wife, Dr. Georgia R. Hsieh, called his death "senseless.""So many have asked what can be done to help. While law enforcement has given you their focus on finding the criminal, I am asking you to use your vote and your voice to stem the tide of this growing public health epidemic," she said in the statement ||||| $5,000 reward offered, new images released in Houston doctor's slaying 
  
 A day after a beloved Houston cardiologist was gunned down while biking to work in the Texas Medical Center, Houston police have released a sketch of the person of interest. A reward has been offered in an effort to catch the killer. less A day after a beloved Houston cardiologist was gunned down while biking to work in the Texas Medical Center, Houston police have released a sketch of the person of interest. A reward has been offered in an ... more Photo: Houston Police Department Photo: Houston Police Department Image 1 of / 14 Caption Close $5,000 reward offered, new images released in Houston doctor's slaying 1 / 14 Back to Gallery 
  
 As the search for a beloved doctor's killer continues, authorities are offering a $5,000 reward for information leading to an arrest. 
  
 Cardiologist Dr. Mark Hausknecht, a renowned Houston Methodist physician who once treated former President George H.W. Bush, was shot to death Friday in broad daylight while riding his bike to work in the Texas Medical Center. 
  
 The Houston Police Department also released images late Sunday night from surveillance cameras in the area that show the bikers crossing paths around 8:47 a.m. Friday 
  
 The 65-year-old was near the intersection of Main and Holcombe when the gunman passed him from behind, police said. Two blocks later, the shooter turned around on his light-colored mountain bike and fired at least twice. The doctor went down immediately, and the shooter rode off northbound. 
  
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 It's still not clear whether the killing was random or targeted, but on Saturday night police cobbled together enough details to put out a sketch of the suspect. 
  
 The wanted man is described as a clean-shaven white or Hispanic around 30, wearing a gray warm-up jacket, khaki shorts, a tan baseball cap and sunglasses. He's about 5-foot-10 with a slender build, police said. 
  
 Police did not clarify Sunday evening whether the sketch had yielded any helpful tips or whether they were drawing any closer to a possible arrest. Crime Stoppers is offering its standard $5,000 reward, the nonprofit confirmed Sunday. The tip line is 713-222-TIPS. 
  
 As the investigation continues, police are still looking for more video footage of the morning, hoping to track down additional images of the doctor's final ride to work - and to possibly learn whether anyone was following him. 
  
 "The more eyes we have on video cameras," Chief Art Acevedo said Saturday, "the greater the chances are that we will capture additional evidence." 
  
 Even as the police investigation unfolded, Hausknecht's grieving widow spoke on the need for gun control legislation, condemning "senseless" violence. 
  
 "So many have asked what can be done to help," Dr. Georgia R. Hsieh told the Chronicle in a statement Saturday. "While law enforcement has given you their focus on finding the criminal, I am asking you to use your vote and your voice to stem the tide of this growing public health epidemic. Write, email or tweet your congressman urging sensible gun laws. We owe it to future generations to leave a safer environment." 
  
 It's not clear if any vigils have been scheduled yet. 
  
 Hausknecht earned his degree from Baylor College of Medicine in 1980 and started practicing in Houston seven years later. He biked to work every day, and took exceptional care of himself, according to those who knew him. 
  
 In the hours after his death, he was remembered fondly by colleagues, patients and co-workers. 
  
 "We will all miss seeing Mark in the hallways and seeing patients in the cath lab and (coronary care unit), where he was known as a compassionate physician with a phenomenal bedside manner," Methodist president Dr. Marc Boom said in statement. "Our employees who worked with him said patients were so proud to call him their doctor." ||||| Houston police are searching for the suspect who fatally shot the prominent cardiologist who treated former President George H.W. Bush. 
  
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 Dr. Mark Hausknecht, 65, was riding his bike today when he was shot and killed, according to Houston Methodist Hospital. 
  
 The former president released a statement about his doctor's death through his spokesman. 
  
 "Mark was a fantastic cardiologist and a good man," President George H.W. Bush said in his statement. "I will always be grateful for his exceptional, compassionate care. His family is in our hearts." 
  
 David J. Phillip/AP, FILE 
  
 In a statement from the hospital, Hausknecht was prasied for his "kind bedside manner" and his compassion. 
  
 Police are searching for a white or Hispanic male suspect who was wearing a dark jacket and fled the scene, according to ABC station KTRK. 
  
 Houston police released a composite sketch of the suspect on Saturday. 
  
 Houston Police Department 
  
 Hausknecht's wife, Dr. Georgia Hsieh, released a statement critical of guns and said her husband's death was "devastating." 
  
 "After spending his adult life saving and prolonging the lives of others, my talented husband, Dr. Mark Hausknecht, had his life prematurely ended," she wrote. "'Senseless' has become a trite adjective to describe these tragedies, but what is senseless is the misguided notion that any society with more guns is a safer society. 
  
 "When students cannot go to school without fear, and teachers need to arm themselves, what has this country come to?" she continued. "As a trained emergency medicine physician, I am no stranger to the devastating consequences of both intentional and accidental firearm use. Now my family and I have joined the ranks of the tens of thousands of other grieving Americans who lose innocent loved ones each year." 
  
 Dr. Kevin Lisman, who worked with Hausknecht for 15 years, told KTRK the doctor did not have any enemies. 
  
 "Mark never had an enemy," Lisman told KTRK. "He was very quiet, and very humble. Just the kind of guy who would take care of anybody at the drop of a hat." |||||
Solution:
Houston police released a composite sketch Sunday of the man who allegedly shot and killed George HW Bush's former cardiologist, ABC News reports. Dr. Mark Hausknecht and the suspect were both biking Friday morning when the suspect, described as a "thin but fit" clean-shaven white or Hispanic male in his 30s who is 5'9" or 5'10", passed Hausknecht from behind, then allegedly turned around and shot him. The suspect, who was wearing a dark jacket, khaki shorts, tan baseball cap, and sunglasses at the time, then fled the scene on his mountain bike. Newly released surveillance photos show both men moments before the shooting; they can be seen at KTRK. Police have released few details about the 65-year-old's killing, including whether it appears to have been a random or targeted attack. A $5,000 reward is being offered for information leading to an arrest, the Houston Chronicle reports. The former president mourned Hausknecht's death in a statement.