Actually, that article is not correct and I watched part of the press conference back (where they point to a photo of Armbrust and Renee) to make sure & they describe a photo of Armbrust and Renee at 33:30. The following link contains the actual photo of Armbrust and Renee. Renee was only 25 when Armbrust died and looked very young:
Man found dead in Colorado mountains in 1974 is identified
You can't really tell because the photo is clipped, but she is wearing a wedding ring.
The photo you posted is of Armbrust and his first wife, and there is another photo of him and his first wife and their daughter together. Unfortunately it seems a few news outlets got this wrong.