Like Cho Seung-Hui, other mass killers have also reached out to the media. Among them: Dennis Rader: In June 2005, the 60-year-old self-named BTK (Bind, Torture and Kill) serial killer who terrorized the Wichita, Kan., area from the 1970s to the 1990s, pleaded guilty to killing 10 people to satisfy what he said were his sexual fantasies. Rader, who had been president of his Lutheran church council, taunted authorities and the news media with letters and packages.
Zodiac Killer: The so-called Zodiac killer murdered five people in San Francisco in 1968 and 1969. Letters sent to San Francisco newspapers claiming to be from the killer were signed with the zodiac symbol -- a cross superimposed on a circle. Some of the letters included coded messages about the killings. The killer was never found.
David Berkowitz: Calling himself "Son of Sam," Berkowitz killed six people in New York in 1976-77, some of them couples sitting in cars, before he was arrested by police who tracked a parking ticket on his car. One of his notes to columnist Jimmy Breslin said: "I am a monster. I am the 'Son of Sam."
Theodore Kaczynski: Known as the Unabomber, Kaczynski assembled and dispatched 16 bombs in 17 years, killing three and injuring more than 20. In April 1995, he sent letters to The New York Times, to two scientists and to a Yale professor he had injured. Two months later, he sent a 35,000-word manifesto to the Times and The Washington Post, threatening to kill again if it was not published. It ran in September 1995, and led to his capture after his brother noticed similarities in the text with his brother's ideas.