 LaGuerta wanted to install Angel Batista, whom she can trust, to be the new lieutenant of homicide division, but as a payback to LaGuerta, Matthews appoints Debra Morgan to be the new lieutenant instead.Later in Season 6, when Matthews was involved in a prostitute's overdose death, LaGuerta used Debra Morgan to keep the case alive and eventually leaked the information to the police chief, who forced Matthews to retire.It was implied LaGuerta would become the next deputy chief.