Josh Jackson was a developer of weapons of mass destruction and brother of Rick Jackson during Day 1. He was involved in the Nuke/Gas Conspiracy with Jackson Hicks and Ronald Watson, and was killed when a Saudi Arabian assassin shot him twice in the chest.
Josh Jackson first came up when Arnold Robinson discovered his role in the day's events at around 2:00 pm. Josh's FBI agent brother, Rick, visited him at his house at around 2:15-2:30pm. Rick then forcefully interrogated Josh and found out that Josh sold the nuclear weapon that was detonated an hour earlier. Then, when Rick was transporting Josh back to FBI for further interrogation, a Saudi Arabian assassin shot Josh twice in the chest, so he couldn't talk anymore about the conspiracy.