carriger showed him the photo. >> we asked, who is that?rs below. >> and just like that, a big piece of the puzzle popped into place. but, fair warning, as you will see, puzzle pieces and some residents of this downtown loft might not be quite what they seem. >> coming up -- >> a massive sense of disbelief. >> the investigation takes as many turns as one of the buildings hallways. >> i've never had a case this complicated before. >> when "dateline" continues. ateline" continues flowers are fighters. that's why the alzheimer's association walk to end alzheimer's is full of them. because flowers find a way to break through. just like we will. join the fight at alz.org/walk every day in business brings something new. so get the flexibility of the new mobile service designed for your small business. introducing comcast business mobile. you get the fastest, most reliable network with nationwide 5g included. and you can get unlimited data for just 30 dollars per line per month when you get four lines- or mix and match data options. available now