Festus Lepetu is the cousin of Ephraim Mogae, who shot Sean Archer. When Ephraim escaped and broke his ankle, Festus drove him to his apartment with Festus' taxi cab. Festus was stopped to get him to reveal Ephraim's location, so he'd get medical attention and to avoid police using excessive force. he was detained when he still didn't cooperate, but Ephraim was still found.
Festus' legal status is left unknown. (L&O: "Charity Case")