The Zodiac killer, which was the name they gave themselves, would purposely send letters to The Chronicle and even would have certain demands. In one letter sent to The Chronicle, the killer demanded that his letter to be printed on the front page or else they would “go on a kill rampage” until they kill twelve people by the weekend. Also, in order to have help with breaking the Zodiac’s secret codes, The Chronicle put his letter in the newspaper with hopes someone could help crack it. That turned out to be a great idea as within about a week, schoolteacher Donald Harden and his wife Bettye contacted The San Francisco Chronicle with their solution. Bettye is credited with discovering phrases suspected to appear in the message. Inspired by the killer’s obvious craving for attention, Bettye guessed that the message would begin with the word “I.” She also believed the word “kill” or “killing”,or even the phrase “I like killing,”would appear somewhere in the message, which was correct.The Zodiac killer was never caught or identified. There were multiple people who the police suspected, but there was never enough evidence to prove anything. Although police did key in on one man, he died before police were able to amass enough evidence against him. Some people, including crime writer for The San Francisco Chronicle, Robert Graysmith, argued that the Zodiac killer remained active through the 1980s and murdered dozens more people. The true identity of the Zodiac may never be found.