Three of four teens pleaded guilty Friday to participating in a robbery and beating that left a Johns Hopkins Hospital employee in a coma.

Eric Price, 17, Arthur Jeter, 18, and Wilburt Martin, 19, face up to 15 years — eight if they cooperate — when they are sentenced in connection with the attack that left Zach Sowers, 27, in a coma June 2 as he was walking from the bars in Canton.