Actor Tom Selleck played a significant role in shaping the character of Abigail Baker in the TV show "Blue Bloods." Initially, Abigail had no last name or defined identity beyond her connection to Selleck's character, Frank Reagan. However, Selleck recognized the importance of giving her a name and background, and he personally came up with the name Abigail. He also ensured that Abigail Baker went beyond being a background character and became an integral part of the series. Selleck's involvement in developing Abigail's character showcased his investment in "Blue Bloods" beyond his own role.