Derek Grady was one of the most loyal lieutenants of Carmine Falcone.
When Carmine got kicked out of Gotham City by the Batman, Derek followed him to Hong Kong. Derek also returned with him to Gotham, posing as a man of Professor Pyg. When Commissioner Gordon confronted Derek, whom Gordon claimed to be holding a firearm, he shot at his hand. This resulted in an explosion which caused the deaths and injuries of hundreds.