New details emerge about the last night Alberta was seen alive. Reporter Connie Walker speaks to a key witness who has never been interviewed by police about what he saw the night Alberta disappeared.

S1 Episode 5: The Black Truck

Where is Cleo? Taken by child welfare workers in the 1970’s and adopted in the U.S., the young Cree girl’s family believes she was raped and murdered while hitchhiking back home to Saskatchewan. CBC news investigative reporter Connie Walker joins the search to find out what really happened to Cleo. For the best in true crime from CBC, ad-free, visit apple.co/cbctruecrime.Watch Connie Walker's&nbsp;A Sister's Promise on The Fifth Estate's YouTube channel now.