The CSIs uncover a female victim on the Navarro estate that matches Esteban's MO. Vina Navarro, Esteban's grandmother, comes forward to help solve the case. However, things take a twist when the team also discovers the three-decade-old remains of a male victim, with evidence linking Diego to the murder. Before he can be arrested, Vina shoots Diego in what appears to be self-defense. Later, the team decodes a microchip disguised as a lollipop in Diego's pocket, which leads them to Esteban's murder lair and the evidence needed to put him away for good.