Sure enough, as soon as he was left unsupervised in the library, Bundy jumped out of a second-story window and escaped. See, this is why we don't guard serial killers using the honor system anymore.
Wait, it gets worse. Within six months, Bundy was caught again and his trial resumed. At this point, legal advisers told him to stay the course, because the prosecution's case was weak and he was likely to get off. Despite this, Bundy devised a crafty if cliched escape by slowly sawing a hole in his cell's ceiling. Then, on Christmas Eve, he hid books under his blanket to imitate a body and escaped through the ceiling.
It turns out that the ceiling led right to the apartment of the chief jailer, a situation that stupidly worked in Bundy's favor, because said jailer was out that night on a date. Bundy raided the guy's closet and stole his clothes, then simply walked out the man's front door to freedom, escaping to the retirement state, Florida. According to his later confessions, he intended to stop serial killing. Then, after he serial killed some more people, we executed the crap out of him. He really did forever ruin our ability to trust serial killers.