Call the FBI, call the Federal Trade Commission, if she has his photo, right click on the photo and the drop down should have "view image on Bing". There will be photos, names and other dating sites he is on. Or go to Bing or Google and search the photo there.
Post a photo on this site and people will tell you what they know about him. If he sends her poetry Google the first line and more than not the poem will come up.