Although this question does not deal directly with Lincoln's assassination I still think it's probably the nearest (topic-wise) thread to put it in. I got the idea for the question from articles Dave Taylor once wrote on his site.
What 23-year-old man was described as follows?
height 5' 7 inches, weight 123 pounds; hair and mustache, black; eyes, dark brown; teeth, good; pistol mark on right side of forehead under hair. The cause of the pistol mark was reported to be the accidental discharge of a pistol.