From the survivors, a sketch of the killer was created. He was described as a heavyset, white male in his late twenties or thirties with short brown hair and thick glasses.

Two days after the cab driver murder, he wrote another letter taking credit for the murder and made threats about attacking a school bus and killing children

In his letters to the newspapers and police, there were marks on the bottom of each letter. It was a score of how many crimes the police have solved, which was zero, while the Zodiac was adding to his list every letter. On the last letter the Zodiac scored 37 but the police never found out who the other 32 victims were.

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