Chilling final moments of California teen Alison Chao before she vanished riding bike to aunt's home
Alison Jillian Chao, 15, was last seen on surveillance footage riding her mountain bike to her aunt's home in San Gabriel, California, on Tuesday, August 10 Alison Jillian Chao, 15, went missing on July 16 when she rode her bike to visit her aunt ( …