Family and friends gathered on Tuesday to say goodbye to a Toronto father and his two small children who were killed in a house fire 10 days.

Stuart Cameron, 44, his five-year-old daughter Mackenzie and four-year-old son Arthur died in an early-morning blaze that torched their west-end home on Feb. 23.

The man's 29-year-old wife Loretta, and the couple's third child, two-year-old Tara, survived the two-alarm fire.

"I'm feeling so heartbroken right now -- I lost my best friend," Loretta told CTV Toronto.

"Almost two weeks ago I was married, I had a husband. And now, I have nothing."

The family tragedy has touched many people.

"It's unbelievable for her to go on without her husband," said one mourner.

Fire officials said the home's working smoke alarms likely saved the mother and daughter. Investigators have not been able to determine the cause of the blaze.

Just a week after the fatal fire, a mother, her young daughters and a teenaged boy were all killed in a house fire in Hamilton. The home did not have working smoke alarms, officials said.

Meanwhile, a trust fund has been established for Loretta Cameron. Donations can be made at any Alterna Savings & Credit Union branch.

With a report from CTV Toronto's Jim Junkin