Ayla Reynolds Update: Father of missing Maine toddler charged with assaulting ex-girlfriend

(CBS/AP) PORTLAND, Maine - The father of Ayla Reynolds, a missing Maine toddler whose disappearance drew national attention, is facing a charge of domestic violence assault after he allegedly pushed his ex-girlfriend.

Pictures: Maine Toddler Ayla Reynolds Missing

Portland police say Justin DiPietro of Waterville, Maine was arrested at 11:15 p.m. July 6 after a lieutenant saw him grab and push a woman on a street. Officials identified her as DiPietro's former girlfriend and said she wasn't injured.

DiPietro's daughter, Ayla, hasn't been seen since she was reported missing Dec. 17, 2011, from DiPietro's mother's home in Waterville, where DiPietro lived. Ayla was 20 months old at the time.

Police have called the case the biggest criminal investigation in Maine history.

DiPietro, who is free on bail, couldn't be reached for comment. His cellphone number is no longer in service, and a new number in his name could not be located.

Complete coverage of Ayla Reynolds on Crimesider