After you file

Ok sorry they didn't let me use a lot of words. My  problem is I'm doing his taxes for 2015 because I had no idea I had to do them. We separated in 2014, but not legally, started our divorce and the judge ordered alimony be paid and child support so he did pay me until December 2015 when he passed away but we never finalized it so technically we are married still. I was not filing taxes for that year because I was a housewife before we separated and after we separated, but was looking for work. So I did not file taxes or claim my daughter for 2015. He waa going to claim our daughter on his taxes. Since I have to file and we were technically married I have to put that so turbo tax automatically tells me to file married filing jointly. Also I was trying to make it easy and not claim all his write offs he usually does either and I have copies of all alimony checks. They said I can't be married and claim alimony... But I'm not HE IS. I shouldn't even be on it right?