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.

But he grew old, this knight so bold / And upon his heart a shadow / Fell as he found no spot on the ground / That looked like El Dorado.