Watch FBI Online: Season 4 Episode 20Paul Dailly at .
Did the gang manage to find the killer of a TSA agent?
On FBI Season 4 Episode 20, it was time to make a tough call as OA struggled to come to terms with the aftermath of the sarin gas exposure.
It also hit him that it was the 10th anniversary of his best friend's death, and he had to do some soul searching.
Meanwhile, Jubai dropped a bombshell on his co-workers.
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