Ah, I missed the disintegrate part. I still think the workflow would be to get the animation all done without disintegration in AE, then you can export the last frame of the person (before disintegration) with an alpha channel, then follow Elvis’ tutorial.
(I’ve been thinking about putting together a St. Louis Area particleIllusion user group, but haven’t made much progress on that yet.)
Alan.
http://www.wondertouch.com