Zodiac seemed to have stopped killing and may have moved away from California in mid 1974. In 1978, an authenticated letter from Zodiac indicated that he was "back".
Could the following article about some unsolved murders have been related to Zodiac in some way? It mentions a theory that a killer was believed to have been moving from west to east, ending up in Florida by 1975.
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From the Washington Post 29 August 1975
Page A - 3 Around the Nation
Killings Tied Together in South Florida
Miami - As many as five of South Florida's 10 unsolved slayings of young women this year (1975) may have been committed by the same murderer, Dade County's assistant medical examiner said he believes.
"The similarities , at least in my mind,. make me feel they were most probably by the same assailant." Dr. Ronald Wright said yesterday.
There is another theory that at least two of those sex slayings might be conneted to 33 other similar killings in five Western states.
Detective Charles Mussoline of the Dade County homicide unit said he was operating on the theory that the killings last month of Ronnie Gorlin, 27, and Elyse Rapp, 21, were committed by the same man. And he said he and Sgt Erwin Carlstedt of Sonoma County, California, were developing a theory that those two were perpetrated by one man as he journeyed from west to east.
Wright said he believed the Gorlin and Rapp murders were the work of the same person who abducted Barbara Stephens, 23, from a South Dade County shopping center in February (1975) and stabbed her to death.
He also said the double murder in June of two 14-year-old Hollywood, Fla., junior high school classmates - Belinda Zeterower and Barbara Schreiber - were connected with the other three.
"The medical examiner's office has a certain responsibility to the public to warn the people of dangers in the environment, " Wright said. "This guy is a danger in the environment."
"I want all young women in Dade and Broward Counties to know what I told my wife. If you're shopping and find something wrong with your car, run screaming in the other direction."
Police believe that the Gorlin and Rapp women were approached by a man who flattened their tires in a parking lot, then appeared offering to help them repair them.