Thomas Castillo

Thomas Castillo was the D.A of Central City and an enemy of both Megan Lockhart and Barry Allen.

History
Thomas had been the under the thumb of Arthur Simonson until he had hired Megan Lockhart to find out who the Flash is so he can blackmail the man behind the mask. After he discovered it was really Barry Allen, he used his secret to threaten his family so he could have the Flash make Arthur back down from Castillo. However, after Barry and Lockhart got the evidence needed to bring down Castillo and Arthur, Castillo escaped, still threatening to release Barry's identity. However his car was rigged to explode by Simonson, killing him.

The Flash

 * "Watching the Detectives"