Now that the gate to the starting area outside of the wall has opened, there is a dead ghost out there. It's through a window on the right side of the catwalk behind the door you walk out of.
Here are some pictures, start with the bottom one...phone uploaded them in the wrong order.
http://imgur.com/a/3rsSW
And don't forget to bump this.
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https://www.youtube.com/watch?v=b21VWqobTpM