I've talked about how our Project Calliope picosatellite will burn up entirely upon reentry.  Larger stuff, not so easy.  UT reports in the cutely titled "Look Out Below!" that the 6-ton URAS is going to reenter, messily, this Fall.
“Satellites re-entering is actually very commonplace,” Johnson said. “Last year, for example, we averaged over one object per day falling back uncontrolled into the atmosphere,” and for those coming back in an uncontrolled fashion – meaning it is a crapshoot when and where they fall — there were 75 metric tons of spacecraft and rocket bodies falling back to Earth.

finishing ebook #1 on Project Calliope this week for O'Reilly Media