Lisa Carol Dickinson was 9 when she disappeared from Walnut Creek, California, on September 5, 1976. She left home about 7:00 p.m. on her red Raleigh 10-speed bicycle, heading toward the nearby BART station, and was expected back by 8:00 p.m. Her parents reported her missing at 9:00 p.m. and a search began. Her bicycle was found about three hours after she was last seen, abandoned in a walnut grove near Heather Farms Park, close to the Contra Costa Canal, but the extensive search of the canal and park turned up no trace of her.

Witnesses described a man in his early 40s with brown curly hair and a mustache riding a medium-sized motorcycle in the area; a young girl was seen riding with him but it has never been confirmed that the girl was Lisa. Louis Richard Fresquez, a convicted sex offender, became the primary suspect, but authorities were never able to obtain enough evidence to charge him in connection with Lisa’s disappearance. The case remains unsolved and Lisa is still considered missing under suspicious circumstances.

Did anyone in the Walnut Creek area in 1976 see the red Raleigh bicycle or the motorcycle that evening?