Not enough info.
Pictures are taken to close up.
One place you say your taking down a wall, then you mention it's a closet.
Need to be looking in the attic and below that wall to see if if it's a supporting wall.
Just looks like there may have been a door there at one time, or they added a jack stud when they went from plaster to drywall so they had a nailer to attach the drywall to.
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