An infant injured in a fatal Winnipeg fire died on Friday afternoon, three days after four other family members perished.

Hoorya Sadiq, who was four months old, was taken off life support by medical staff at Winnipeg's Children's Hospital, according to Shahina Siddiqui from the Islamic Social Services Association.

The father of the household, Hamid Farooq, had to make the difficult decision. The family had come to Canada from Pakistan in 2007, and the grandmother was visiting from her native country.

Earlier Friday, fire investigators said that smoke inhalation had caused the deaths of a mother, grandmother and two children.

The have been identified as Zebunesa Sadiq, 33, grandmother Shemeen Akhtar, 60, Fayza Peyawary, nine, and Aliza Sadiq, four.

Farooq was at work at the time of the fire.

The investigation in to the blaze, which was reported around 8:30 p.m. Wednesday, is still ongoing.

"There (are) smoke detectors within the residence. Right now, we are still underway to determine whether those were operating and functioning smoke detectors," said Const. Natalie Aiken from Winnipeg police.

Meanwhile, friends, extended family and the Muslim community have been doing their best to comfort Farooq as he copes with his loss, said Siddiqui.

"He slept a bit last night. They were able to get him to shave and all that so he's feeling a little better and the friends are coaxing him to eat," she said.

Neighbours reported seeing smoke from the Winnipeg home and fire investigators responded quickly. Later, as emergency crews emerged from the home, neighbours could only watch and hope.

"It was just such a devastating sight to see that. We were all kind of standing there thinking, ‘What just happened here?'" said Gabriella Warbansky, who called 911.

There is no indication that the fire is suspicious.

Another neighbour, Shalla Dorey, also witnessed the aftermath as emergency crews worked at the scene.

"There was two adults in the snow in the front, and then I spotted (the girl) who was nine and played with my daughter off-and-on through the several years they'd lived here," she said this week.

"I saw her in the back of the emergency response truck, and they were working on her."