Mother's Day

Secrets arise when Gibbs's former mother-in-law surfaces as a witness in a murder investigation. At first, the crime appears to be a simple robbery gone awry, but deeper investigation reveals that there's more to the story. The victim, a Navy captain, was involved with the same drug cartel that killed Gibbs' first wife and child. His mother-in-law eventually admits that she killed the captain in revenge for her daughter and granddaughter's death, and Gibbs' tells her he murdered their real killer as well. Despite the confession, Gibbs cannot bring himself to arrest his own mother-in-law. He convinces Allison Hart to defend her, and then on purpose makes crucial legal mistakes on arresting her (not reading her her rights, questioning her without legal council), so Hart in her typical hardball style convinces him swiftly to let her go.