Shannon Alexander (born March 29, 1991), who is also known to use the surname Mathewsie, was a teenager who disappeared alongside her friend, Maisy Odjick. Alexander's latest age progression depicts her at 24.
- Short, brown or black hair.
- Brown eyes.
- Acne scars.
- Pierced earlobes.
- A scar is on Shannon's left knee.
- A thin build.
- A pockmarked complexion.
- Shannon might be wearing a silver necklace with a feather on it.
Maisy and Shannon went to the Maniwaki Arena on the evening of September 5, where several other teenagers confirmed their presence. After they left, Maisy went to spend the night at Shannon's residence. Bryan Alexander, Shannon's father, was the last person to see the girls; Shannon walked with Bryan to a nearby bus station while Maisy was still sleeping on the morning of September 6. Shannon was reported missing to the Sûreté du Québec Police on September 10.
In March 2009, the Sûreté du Québec (Quebec Provincial Police) said there was reason to believe Maisy and Shannon could've ran away, but didn't reveal evidence out of concern that it'd interfere with the investigation. However, the Kitigan Zibi Police had no evidence to support this claim. Neither girl took their wallets, IDs, spare clothing, extra money, or any other belongings with them.
There's been unconfirmed sightings of Maisy and Shannon in Montreal, Quebec; Ottawa, Kingston, and Port Elgin; Ontario