Williams was shot to death on Jan. 23, 2013, in his home at 51 Ardglen Dr., a co-op housing apartment in Brampton.
Police have yet to make an arrest in the case. They would not comment on when or how the gun was found.
The boy was shot in the back of the head through his living-room window while watching TV.
Officers say the recovered firearm is connected to another homicide in Toronto, but neither police force would say which one.
A $25,000 reward for information in this investigation is still being offered by Peel Police.
Kesean’s mother, Tanya Garvey, who was looking to save extra money for her two boys, moved her family to the apartment from a home around the corner just three days before the shooting.
“This has been the most devastating heartbreak,” Garvey told the Star in 2013. “I don’t know how to explain it in words because all I know is that I feel pain, pain that won’t go away. I see the sun and Kesean’s not there to enjoy it.”
Peel police are appealing to the public for any new information related to this incident. To leave a tip with the Homicide and Missing Persons Bureau, call 905-453-2121, ext. 3205 or reach out anonymously by calling Crime Stoppers at 1-800-222-TIPS (8477).