India, Oct. 3 -- Chilling footage of Decarlos Brown, the suspect who fatally stabbed Iryna Zarutska in a Charlotte bus, has surfaced. The newly released surveillance clip shows the moment the 34-year-old attacker boarded the bus, two hours before Zarutska, 23, took her seat on the light rail.

CBS affiliate WBTV posted the video to reveal that Decarlos Brown did not pay his fare or show a bus pass back on August 22. He remained silent for a few minutes before breaking into laughter. It is unclear why he was laughing.

Brown later yawned. He moved back on the bus and continued laughing. An hour later, at approximately 9:46 PM, Zarutska boarded the bus. Brown stabbed her just before he exited the light rail. As bystanders watched, he exited...