Tyler Robinson, the man accused of killing conservative activist Charlie Kirk, walked into a Chick-fil-A and bought a meal prior to the shooting, an investigator testified on Tuesday. 

Robinson first arrived on campus about four hours before Kirk was killed, Utah State Bureau of Investigation Agent David Hull testified. Wearing shorts and a T-shirt, Robinson made contact with Kirk's staff. He then changed clothes before climbing onto a rooftop where prosecutors say he shot Kirk, CBS News reported. 

Hull described the alleged assassin's movements as previously unseen surveillance videos were played during Robinson's preliminary hearing on Tuesday. Erik Kirk, Charlie Kirk's widow, appeared to sob and dab her eyes as the video was played. 

Robinson has not yet entered a plea. 

Chick-fil-A became the target of a boycott by liberals who were angered by comments made by then-CEO Dan Cathy in 2012. In an interview, Cathy stated support for traditional marriage.