Filling a gap between wall and door frame.
 

Hello this is my first post. Thanks ahead of time for any help.

I recently moved into an old house in Brooklyn. I've been told its about 100yrs old.

There was an old telephone wire going around a door frame that must've been just painted over for the last God knows how many years. The corner was a mess of paint and plaster as well. As I was pulling the wire out a lot of the paint and plaster started to come out of the seam between the wall and the door frame revealing a faintly large gap between the wall and the door frame. Should I fill this in with plaster or drywall mud? If you can see the frame is pretty far off the wall. its on a door to the outside, so im also wondering if i should stuff it with insulation. I'd like to restore it to a clean sharp corner if possible. While I'm pretty handy, I've never done a project like this. Thanks again.

what is under the orange paint (sheetrock?), and then what is under that (studs?)? is that door at all secure the way it is hung now?

Back up and take another picture.
Sure looks like that door was sort of framed way to close to that corner.

Believe it it sheetrock, but don't know if there are studs. It's an outer wall, so maybe not. The door is secure around all the other sides. I don't know if just a century of weather has caused it to pull away from the wall or if it was ever flush with the plane of the wall. I'll get some better pictures up tonight when I get home.

Thanks for the reply.

I'll get some better pics up tonight when I get home. The only reason it looks like there's a corner is because the door frame has pulled out to almost an inch off the plane of the wall.

Thanks for the reply.

Here are those other pics I promised.