According to Animenewsnetwork.com, tonight is the last night Toonami airs on
Cartoon Network.

Over the 11 years the Cartoon Network ran its Toonami
block, it ran many genre anime, including the original
Mobile Suit Gundam, Blue Submarine No. 6, Voltron,
Robotech, Outlaw Star, Ronin Warriors, Naruto, Tenchi
Muyo!, The Big O, and .Hack//Sign. According to
Cartoon Network’s schedule, the block will be filled
in the next few weeks with Spider-Man
on September 27th and Batman:
Gotham Knight
on October 4th.