Chris Mara was a former member of the Los Pollos Hermanos security staff, serving as an enforcer for Gustavo Fring's meth distribution network where he answered to Mike Ehrmantraut. He appeared as a minor antagonist in Season 4 and Season 5.
He also accompanied Gus to the hospital where he confronted Jesse,("End Times") and drove Gus to the Casa Tranquila Retirement Home when he was preparing to execute Hector "Tio" Salamanca. ("Face Off")
After Gus was murdered, Lydia Rodarte-Quayle paid Chris $10,000 ($30,000 for Mike) per hit for Chris to take out some loose ends that could tie Gus's network to herself. Chris murdered Duane Chow and lured Mike over to Chow's house, but Mike caught him unaware and shot him. ("Madrigal")