Circumstances of Disappearance
Hanna attended the "Celebrate In '88" festival at the Lucknow Arena in Ontario, Canada on July 3, 1988. She was accompanied by her family and friends at the event. Hanna left the arena at approximately 11:45 PM that evening, saying that she was tired and needed to report to work the following morning. Hanna drove her red 1987 Pontiac Grand Am back to her residence on Nelson Street in Kincardine. She arrived home at approximately 12:15 AM on July 4.
Authorities have surmised that Hanna may have been followed home or perhaps her house was being watched for her arrival.
Her burgundy Grand Am was parked in the driveway and all three of the house's doors were locked. The television set was still on and a half-finished cup of tea was on her kitchen counter. The pink outfit she'd worn to the dance was hung neatly in her mirrored closet. Her purse and keys were in the china cupboard where she always kept them. There was no sign of a struggle.
The only items missing were her peach nightgown and matching robe. The only clue was two pea-sized drops of blood were found on a wall next to the side door of Lois' home. For years, all that was known about the blood was that it came from a male.
Hanna has never been seen again. She was reported missing to the police department after she failed to report to work, at MacG's, a women's clothing store in Kincardine, later in the morning of July 4. Hanna is a former Miss Mid-western Ontario beauty queen and had studied fashion at Fanshawe College.
Police believe Hanna was followed home from the dance and abducted. Massive searches combed the area, aided by volunteers and OPP helicopters, dive teams and tracking dogs. More than 20 searches took place over a period of about 10 years. Nothing worthwhile was found.

Many theories have been considered and many have been discounted. Police say Lois did not fall prey to Paul Bernardo or any other known serial predator, nor is there any link between her disappearance and that of Lisa Maas, an Owen Sound woman who also vanished in July, 1988.