Accomplice
Ballentine's Law Dictionary · James A. Ballentine · 1916
Ballentine's Law Dictionary
One so connected with the crime that at common law he might himself have been convicted either as principal or as an accessory before the fact. See Ann. Cas. 1913A, 771; also 20 Am. St. Rep. 163 and 39 L. R. A. (N. S.) 704, and note.