A US Navy Seal was killed fighting Islamic State militants in Iraq Tuesday after jihadists managed to penetrated a Kurdish stronghold, according to ABC News. “Our state and nation are in mourning today over the loss of a US serviceman –- and one of America's finest. Navy SEAL Charlie Keating, a graduate of Arcadia High School in Phoenix, was killed this morning in an ISIS attack' in Iraq, Arizona Governor Doug Ducey said in a statement. Keating was the grandson of Charles Keating, a well-known Arizona banking executive and anti-pornography activist who was later jailed on numerous fraud and racketeering charges.