The mother of Kesean Williams, the nine-year-old boy who was shot while watching TV in his family's Brampton home, has a message for whoever pulled the trigger.

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Kesean Williams, 9, was killed on January 23. (Supplied)

"I want people to realize that once you pull a gun and decide to make that action you can't take it back," Tanya Garvey told CBC News in an exclusive television interview. "I can never get Kesean back because of a gun."

On the night of January 23, just three days after she and her two sons moved into a Brampton townhouse, a bullet pierced through their front window, hitting Williams in the head. He died hours later in hospital.

Up until late 2012, the family lived in Hamilton, residing in an apartment in the city's north end.

"Words can't even describe Kesean," Garvey said. "He was an absolute little angel."

Police have said the shot that killed the child "was not a stray bullet" and have suggested it was intended for someone else. They don't currently have any suspects.

Neighbours told CBC News they suspect the home had been a haven for drug activity before Garvey and her sons moved in.