. >> darlene ferrin was 22 years old. she was a wife, a mother, and she was a very popular waitress at a local restaurant. >> she had been married once that ended, and she was relatively early into her second marriage. >> darlene or d as i knew her. we met through our work. i was a cook and she was a waitress at the pancake house. we ended up getting married. the daughter was born in january of 1968. she was a type of person that people could fall in love with just because she was outgoing and bubbly. just friendly to people. i know it upset a lot of the other waitresses that she worked with, because she always made better tips. >> on the night of july 4th, darlene farrin had apparently been out everybody's downtown. >> the sky is full of fireworks crowds. there's marching bands. >> i was working at my regular job. she was going to go out and buy some fireworks, and we were going to meet at the house. >> she went out with her friend michael, just to kill some time until her husband got home from work. >> we don't know for

. >> darlene ferrin and michael michaud. drove to blue rock springs park. they parked in the parking lot again, a lover's lane area, and had only been there a few minutes in. a car pulled up behind them. he opened fire through the window of the passenger side and at the hospital, darlene is pronounced dead, but michael miraculously survives. >> we think it is. it appears to us that he is killing just for the thrill. >> just days after the initial communications from the killer, a letter arrived. >> dear editor, this is the zodiac speaking. >> normally, a serial killer gets a name from the police or from the newspapers, but in his case, he came up with his own name. >> it included a cipher that when solved, read. i like killing people. >> september 27th, 1969. the zodiac showed up at lake berryessa, where brian hartnell and cecelia shepard were lying by the water's edge. the man plunged a long knife into bryan's back and stabbed him approximately six times. and cecilia. she was stabbed five times in the front, five times in the back. the killer left both of