I may be a little all over the place here so bear with me...
This story states that DS worked at the Blanchette family owned cleaners.
http://heavy.com/news/2015/09/derek-saretzky-hailey-dunbar-terry-blanchette-murder-suspect-facebook/
Somewhere I read that TB often brought Hailey to his place of business and they adored her; I might make an assumption that TB also brought her to the family owned cleaners from time to time and this is why the godmother stated “Bring her back. If you honestly love that little girl, and you took away her father, you don’t love her.” (and we all realize now that the whole town knew who drove the white van).
Is the murder of the elderly woman related? My guess is yes. Which hopefully makes more sense as to why suddenly CD is telling us she hasn't spoken to DS in years. It was random. Maybe he made a delivery to the elderly woman's home or she was a customer. Maybe TB and DS had words and DS couldn't move on about it. It is entirely possible that CD had nothing at all to do with this. I feel that maybe DS murdered Terry, then took the poor child and because she had to have been loud, he killed her as well.
It is horrible.