[THIN] processes stuck from non-logged in user

I have run into a situation a few times now where a user is not logged
into a server (per management console and terminal serve manager), yet a
slew of processes for that users still exist in task manager.

The kicker is, I cannot kill those processes with task manager or
pskill, no matter what I try.  Anyone seen this before and have any tips
on how I kill these processes?  

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