During the questioning, they found out that Allen wore military boots, had a zodiac watch, and that he was ambidextrous. This leads the Vallejo Police Department to make Lee their prime suspect, but they only had circumstantial evidence. Dave Toschi knew Arthur Leigh Allen was indeed the Zodiac Killer, but he did not have the solid evidence to actually prove it. Several years went by and the Vallejo Police Department initially gave up on the case. Robert Graysmith took matters into his own hands and decided to reach out to one of Darlene’s old friends. The friend admitted that Darlene was acquainted with this strange man that went by his nickname. Graysmith learned that the man that she was talking about being Arthur Leigh Allen, the prime suspect in the case. This leads the Vallejo Police Department to finally bring in Mike Mageau to identify the man who murdered Darlene Farrin and attempted to murder him. He confirmed that Arthur Leigh Allen was indeed the man who he saw that night at the murder scene. Before the Vallejo Police Department could make an arrest, Lee had died of a heart attack a couple of years