North

Agent North was a Secret Service agent during Day 5.

Day 5
After Walt Cummings informed First Lady Martha Logan that former President David Palmer had been assassinated, the First Lady ran to alert her husband, President Charles Logan, of sensitive information to which only she and Palmer were privy, even though he was in the middle of a press conference. At 7:30:18am, Walt alerted Agent North that the First Lady should not be permitted to disrupt the conference. North was able to contact another Secret Service agent, who held her at bay until more familiar faces arrived and calmed her down.