Attack on Titan has finally made its way to Toonami block and starting May 3rd, the show will be airing at 11:30 PM. Before the announcement, Space Dandy used to be aired at 11:30 PM which will now rerun at 12:30 AM.
Attack on Titan to Air on Toonami in May
Attack on Titan was the most anticipated anime of 2013 and people were always wondering when it will be aired at Toonami, but recently with the announcement of Attack on Titan English Dub by FUNimation, it was confirmed that Attack on Titan is making its way to Toonami.

Source: Toonami Tumblr