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There's been a mysterious disappearance in a notorious murder caper in Atlanta ... and TMZ has put the pieces together and the missing person ... IS THE NEW BACHELORETTE!

There have been rumors Andi Dorfman -- the smoking hot lawyer lady who dumbed herself down to impress "Bachelor" Juan Pablo -- will become the next "Bachelorette".

So here's our smoking gun that it's true. Andi is currently in the middle of a murder trial in Atlanta and she has mysteriously just taken a leave of absence -- and no one in the Fulton County D.A.'s Office will say why.

Here's the thing. We've now confirmed that Andi is indeed this summer's "Bachelorette."

So case closed.