"Police said a woman came to the home looking for her fiancé. When there was no answer at the door, she broke into the basement and found a dead body on the back porch.
When officers got to the scene, they said they found two other dead bodies in the back yard."
From:
3 found dead outside northland home, neighbors say they are in shock
I honestly don't know whether that means inside in the sunroom or perhaps she stepped out of the sunroom to the concrete pad with the roofed area to check on the victim she saw.
If freezing to death was what happened, I don't think the victim was in the sunroom. It looks like a wide doorway opening into it from the house with no obvious door shutting it off from the rest of the house, plus in one photo you can see a heat vent on the wall. While it may have been cooler than the rest of the house because of so many windows, I don't think someone would have frozen to death inside the sunroom.
Plus if someone was dead in the sunroom, isn't it possible that there would have been a smell after 2 days? It's right beside the kitchen. Would the homeowner/renter not notice?
Of course the observations are moot if freezing didn't figure into the COD.
MOO.