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One of Our Own is the twenty-fifth episode of Season 4 of CSI: Miami and also the Season finale.
Horatio and Delko search Miami to bring down the Mala Noche gang once and for all after the murder of someone very close to them. However, their quest is jeopardized when the Feds seize the CSI lab with the intent to close it for good, based on the tip from the mole inside. When the mole is finally revealed to the entire lab, as well as the murder of an officer familiar to Delko, Caine and Wolfe the news sends the remaining CSIs reeling.
- Officer Aaron Jessup is killed in the line of duty.
- The FBI led by Agent Glen Cole arrive at the Miami-Dade Crime Lab in hopes of getting some bad evidence which they can use to close the lab forever.
- It's soon revealed that Natalia Boa Vista is the FBI mole.
- Monica West is exposed as the thief responsible for stealing the money from the Crime Lab and ends up being arrested.
- Upon learning that Riaz is going to Brazil, Horatio and Delko decide to follow him there so they can avenge Marisol.