Dave Toschi, the lead detective in San Francisco's unsolved Zodiac serial-killer case of the 1960s and ‘70s, and who served as the model for charaClint Eastwood's "Dirty Harry" movie character, has died at age 86. Toschi died Saturday at his home in San Francisco after a prolonged illness, his daughter Linda Toschi-Chambers told the San Francisco Chronicle. Toschi's investigation into the Zodiac case began with the shooting death of a San Francisco cab driver in 1969. He was taken off the case nine years later after acknowledging he wrote and mailed anonymous fan letters to the Chronicle applauding his own...