The Zodiac killer is one of the most elusive and unusual serial killers in American history.

Riverside Police Officers at the crime scene of Cheri Jo Bates, the first suspected victim of the Zodiac Killer.

Known for his bizarre, rambling handwritten letters, the Zodiac sent baffling ciphers, quoted musical lyrics, taunted police, and threatened to shoot school children.

Approaching the Lake Herman Road crime scene.

Unlike most serial killers, the Zodiac called police to report his crimes and wore a hooded costumer featuring his chosen symbol, the crossed circle.

Following the Blood-Soaked Footsteps of the Zodiac Killer

Vallejo phone booth used by the Zodiac to report the Tom Voigt
Blue Rock Springs attack.

The Zodiac wounded two people and killed at least five others during the period between December 1968 and October 1969.

Following the Blood-Soaked Footsteps of the Zodiac Killer

An eerie writing the Zodiac Killer left on the car door at the Lake Berryessa crime scene.

More letters, postcards, and other clues continued until 1971 when the Zodiac disappeared.

Following the Blood-Soaked Footsteps of the Zodiac Killer

The lifeless body of a cab driver Paul Stine.

In January 1974, the San Francisco Chronicle received another letter which hinted at suicide and described the classic horror film The Exorcist as “the best saterical comidy.”

Following the Blood-Soaked Footsteps of the Zodiac Killer

San Francisco homicide inspectors David Toschi and William Armstrong go through a Zodiac victim’s clothes at the morgue in the Hall of Justice in San Francisco.

Hoax letters continued over the years, but the infamous Zodiac vanished into the history books, leaving a bloody trail of morbidly fascinating physical and visual clues.

A GRAPHIC Look Back at Richard Ramirez's Reign of Terror

Behind the Tape Photobook features 18 fascinating shots of the Zodiac Killer’s reign of terror, along with nearly a thousand more crime scene photos.