there s a manhunt in houston, texas, tonight. police are looking for a man accused of killing a renowned cardiologist who once performed surgery on george h.w. bush. the doctor was gunned down on his way to work at a hospital. he and the gunman were both riding bicycles. when their paths crossed, the gunman opened fire. this is the suspect caught on surveillance video moments before the deadly attack. with more on the manhunt and the crime, here s cnn s ed lavandera. reporter: houston investigators say as soon as joseph pappas suspected that investigators were closing in on him, he jumped on his ten-speed schwinn bicycle, pedaled away from his neighborhood, and disappeared. police chief art acevedo says there s a sense of urgency to capture the 62-year-old murder suspect. he s in great shape. he s a great marksman, and he s a great danger. so let s hope that somebody knows where he s at and calls us. reporter: investigators believe pappas motive for killing dr. mark hausknecht w
here behind me that have not slept. and obviously by our detectives that have not slept. lastly, i think this case illustrates that with the cooperation and with the engagement between local law enforcement and the communities we serve, this is what we get. we get resolution. we get it quickly. and we get it before there s another loss of life. with that, i ll open it up to any questions. chief, do we know how pappas has been getting around? that ll be part of our we ll go straight to cnn s ed lavandera for more. ed, talk about the extent of it manhunt. reporter: well, it has been rather intense throughout, really concentrated in the city of houston. police, as you heard the police chief there talking about, had found his car inside his home, and they suspected that joseph pappas left his home earlier this week on this ten-speed schwinn bicycle, the same