Watch FBI Online: Season 4 Episode 21Paul Dailly at .
What happened to Maggie?
On FBI Season 4 Episode 21, OA received a stunning update about his ailing partner.
Meanwhile, the rest of the team investigated when a retired DEA agent was shot.
The team worked to determine if the victim's past cases or current job were connected to the murder.
How did it all play out?
Use the video above to watch FBI online right here via TV Fanatic.
Catch up on all your favorite shows and reviews and join in the conversations with other fanatics who love TV as much as you.
TV Fanatic is your destination for the latest news, spoilers, reviews, and so much more!
Paul Dailly is the Associate Editor for TV Fanatic. Follow him on Twitter.