Danny Ruskin - Agreeing with all points made by a previous comment maker with regards to this suspect, but would like to add one point...

I have always been convinced that 'he is mar' literally meant just that - (Synonyms: blight, blotch, defect, deformity, disfigurement, excrescence, excrescency, fault, flaw, imperfection, blemish, mark, pockmark, scar).  In one scene where he appears his eye is watering even Jane remarks upon this.

This episode just jumped out at me, the only thing that has held me back is how does he have connections within fbi and cbi? He kind of fits the bill for all other clues