Season Two finds Murtaugh navigating the stress of the job and some trying times at home with wife Trish, their new baby and teenagers Roger, Jr. and Riana. He looks to Riggs for support, but starts to discover that Riggs’ past might have left him more damaged than he thought.
Murtaugh follows Riggs down to Mexico, where he plans to avenge his wife's death and finish off Tito Flores (guest star Danny Mora) once and for all. Once back in the States, they have a few people to answer to during the ongoing investigation around Flores, including Murtaugh's family. Meanwhile, Avery is questioned by Internal Affairs about the integrity of his department.