Update: I've got dA staff to take down my stolen art, but there is still some stolen art in their Gallery, so I ask you guys to help me track down the original artists that got their art stolen, please, and thank you.
So yeah, there's this art thief that has stolen one of my, and many other people's pictures, posting it as their own. This person isn't listening to people's requests to take down the stolen art, and I thought I'd give everyone following me a heads up about this person. Thanks to immakittenz (https://www.deviantart.com/immakittenz) for letting me know of this art thief.
Edit:
Link to his profile: http://jeffthekillerfan1324.deviantart.com/