we have learned tonight that a camera on a city bus captured the entire murder. the police chief told me it is the most chilling video he has ever watched. he also said that he is thankful the community helped catch a killer, tom. >> marcus moore for us. marcus, thank you. news tonight about the desperate search for that missing student in iowa. authorities looking through ditches and farms for mollie tibbetts who vanished while jogging more than two weeks ago. the reward now jumping to more than $200,000. abc's alex perez is in iowa. >> reporter: tonight, mollie tibbetts' father, begging for help. >> we're all in this together. we're all trying to bring molly back. >> reporter: her boyfriend dalton jack making an emotional plea to mollie's possible abductor. >> just try to put yourself in our shoes. what if somebody had taken somebody that you love so much, and just have the courage to come forward. >> reporter: it's been more than two weeks since the university of iowa student vanished. authorities have searched nearby properties, investigated a report of a possible sighting in