Investigators at the San Francisco Police Department racistly assumed The Zodiac was a white man, based on the neatness of his handwriting. But take this eyewitness sketch and invert the colors, it clearly shows a man strikingly similar to Bill Cosby. The trademark Cosby eyeglasses and slicked back mop of sweaty black hair are clearly visible.
Bill Cosby famously wore a Zodiac brand wristwatch. When an interviewer asked about the mysterious timepiece he smiled sinisterly and replied "I am a man of many secrets and hidden aliases, you can set your watch by it."
Cosby's agent has made it clear that questions about Cosby's whereabouts on specific dates during the 1960s-70s are off-limits for interviews. When an NBC reporter pressed Cosby on the issue and brought up the fact that witnesses report seeing him in the vicinity of Lake Berryessa in September 1969, the site and date of a horrific Zodiac murder, his handlers told her the interview was over and hustled Cosby away.
All the known Zodiac killings took place during full moons. The moon is the ruling planet of the zodiac sign Cancer, which happens to be Bill Cosby's star sign. He often spoke of consulting his horoscope and "Getting [my] work done" when the moon was full. He would often leave the house on secretive trips, refusing to discuss the matter with his wife.
According to recently declassified documents, Cosby would allegedly fool women into stopping their cars in rural areas by claiming they had problems with their tires, then loosen their lug nuts and eventually take them captive.
It is known that Cosby was a close friend of the lead SFPD detective working the case. Cosby invited him to tapings of The Cosby Show and would constantly press him for information about the killer and suspects.
A corkboard with newspaper clippings about the Zodiac Killer is clearly visible in Bill Cosby's study, as seen on an early episode of MTV Cribs. It isn't a small corkboard either, it's massive. He was obsessed with the case.
Zodiac left size 10.5 size footprints at the crime scene. According to the Bill Cosby wiki, Cosby wears the same size.
Bill Cosby's wife has revealed that knives, a rope, guns and bullets often went missing from the house, all weapons used in the murders.
Cosby has repeatedly refused to give hair and semen samples that could potentially clear his name. Police have used DNA evidence to rule out several previous suspects. What does Cosby have to hide?
Friends report that Cosby had an active interest in ciphers and codes, often spending days completing giant crossword puzzles.
Finally, the Zodiac Killer's famous unbroken cipher has now been decoded by a user on Reddit, the proposed solution was reached by reversing the letters decoding them using an asymmetric key algorithms, it reads
I AM BILL H COSBY