I just read the story in full. The reason I can't find other news of it is that he (Demmick) hasn't been officially charged, just accused by one of his victims.
Impressive that they went to Congress to raise awareness, but not surprising that hardly anyone reported it.
"There is a Catskill eagle in some souls that can alike dive down into the blackest gorges, and soar out of them again and become invisible in the sunny spaces... even in his lowest swoop the mountain eagle is still higher than other birds upon the plain, even though they soar." -- from Moby-Dick