CNN  — 

Santino William Legan looked like an “average guy,” said witness Julissa Contreras. He appeared older than his 19 years, but he didn’t seem angry as he opened fire on innocent people at the Gilroy Garlic Festival in Northern California.

Legan dressed the part, said Contreras, who was standing about 20 feet from the gunman when he began firing a semi-automatic rifle into the crowd.