Alderson was an FBI agent who was following Agent Johnson (who had John McClane and Matt Farrell in his car) to the DHS Headquarters.
Live Free or Die Hard[]
Alderson was one of many FBI agents present on the scene of the cyber-terrorist attack on the United States. He was evacuated out of the building along with the entire FBI. Later, he is seen driving his car down a road along with FBI Agent Johnson. Unknown to him, he was being followed by Thomas Gabriel's henchman Del, who shot him and the remaining agents from the helicopter.