All the evidence was circumstantial on him.I don't believe it was him. By the way it's crazy how many people could fit Zodiac profile on a relatively small area - it shows that anybody anytime could be a suspect in some case going around. Scary.
Either way, back to ALA:
His fingerprints, DNA (although we really don't know it's Zodiac's DNA that police have) and handwriting did not match.
He wasn't a particularly good match for the sketch and Kathleen Jones (who was abducted by the Zodiac and spent around 90 minutes with him in a car) never identified him from a 16 photograph line up.
He was left-handed and we know the Lake Berryessa attack and the murder of Paul Stine were all carried out by an attacker using his right hand.
He was a known sexual offender and I don't believe someone like that would restrain his lust when killing people. Zodiac's victims were never sexualy abused.