poison the third parties present (and might end up drinking the coffee himself). Walt pushes Jesse to try to set up a meeting when Walt learns Hank is investigating Gus, but Walt backs off when he sees a text message implying that Jesse has been lying about not meeting Gus. Walt puts a tracking device on Jesse's vehicle and learns that Jesse had dinner at Gus' house the night before. Walt confronts Jesse, leading to a physical fight. Jesse gains the upper hand and commands Walt to leave and never come back. Gus and Mike take Jesse on a trip to Mexico to have him teach Walt's formula to the cartel's chemists. Impressed with Jesse's skill, Gus seemingly arranges to have Jesse become their permanent cook. However, during a party, Gus uses a poisoned bottle of tequila to kill off the cartel's leadership, including its chieftain, Don Eladio Vuente (Steven Bauer). Jesse saves Mike, who is shot during the chaos, and Gus, who purposely drank the poisoned tequila to get the cartel to do the same. Afterward, Gus offers to hire Jesse as his full-time cook. Jesse accepts on the condition that Gus spares Walt's life. When Walt's wife Skyler (Anna Gunn) and his children receive protection from the DEA following a threat on Hank's life, Gus uses the information to portray Walt as an informant, further attempting to widen the gap between Walt and Jesse. Walt goes to Jesse's house to plead for help, but Jesse throws him off his property. Shortly afterward, Brock falls deathly ill. Jesse guesses that Brock has been poisoned by ricin and immediately assumes Walt is responsible. Jesse shows up at Walt's house and confronts him at gunpoint. However, Walt convinces Jesse that it was Gus who poisoned Brock, reminding him of Gus' willingness to kill children. Jesse eventually tells Saul about Gus' visits to cartel enforcer Hector Salamanca (Mark Margolis) at the latter's nursing home, leading Walt to visit Hector himself and talk him into luring Gus to the location. Gus is subsequently killed when Walt sets up and Hector activates a pipe bomb beneath the elderly drug lord's wheelchair. After learning of Gus' death, Walt storms Gus' superlab and rescues Jesse. After they destroy the superlab, Jesse reveals that Brock was not poisoned by ricin, but by lily-of-the-valley berries. Jesse realizes that Gus could not have poisoned Brock, but Walt assures him