Did you have him do a performance improvement plan?
Overlooked post.
There should have been weekly coaching or performance improvement discussions. If it took 4weeks to complete a 1week project, a good manager would have identified this during week 2 and developed a remedial plan to address it (ie. bring in additional resources, off board the slacker - maybe his skill set did not align to the project requirements)
Was it the breh's first fukk up?
This thread
and he was making insensitive cultural comments