As police officers spent the day canvassing a Mississauga neighbourhood as part of a homicide investigation, neighbours are still absorbing the shock of learning that a second member of the same family had died under unusual circumstances.

Peel Regional Police announced on the weekend that the death of 41-year-old Caleb Harrison is being considered a homicide.

Harrison was found in his Pitch Pine Crescent home, near Winston Churchill Boulevard and Burnhamthorpe Drive West, by a co-worker on Friday afternoon.

Police have not publicly revealed how he died, but say there was no obvious sign of trauma.

The Mississauga father was last seen alive on Thursday evening, when he coached his children's baseball game and then drove home.

His children went home from the game with their mother, Harrison’s ex-wife.

Police want to speak to anyone who may have seen or spoken with Harrison after he left the game.

On Monday, investigators went door to door and handed out flyers asking for members of the public to come forward with information.

At a news conference on Sunday, police confirmed that Harrison had previously served time for a charge of impaired driving causing death.

Police have also revealed that Harrison’s mother died in the same house in 2010. Her death is considered suspicious and remains an open case.

Larry Sturino, a neighbour who knew both Harrison and his mother, said it was shocking to learn of the latest tragedy at the home on Pitch Pine Crescent.

"It's just unbelievable what happened to the family," Sturino told CBC News in an interview.

Sturino said Harrison was a devoted father to his two children.

"Caleb was a great parent … he looked after the children just fantastically, they always had smiles on their faces," said Sturino.

"He coached them in baseball and he actually helped my grandson get into baseball. He was just a great parent, a great friend, and it's just a tragedy what happened and we're going to miss him."

With a report from the CBC's Natalie Kalata and Genevieve Tomney