I did a Close up on the hair and it most resembled the guy who showed sloane rambaldi. The same one who told sydney about her sister before he got shot in the desert. (the guy from Kung - fu)
IF you remember when Sloane was getting the Chair, JAck put some chemical into sloanes Wine before he was "Fried". That chemical Stopped his heartbeat so Jack can later restart it with another chemical. There was emphasis on Vaughn AKA Andre MAchaux To drink the juice (Which conatined the heart...