You won't believe who REALLY killed Batman villain Ra's al Ghul

gamesradar.com:

We've known since the beginning of the Batman-Robin-Deathstroke Inc. 'Shadow War' crossover that Slade Wilson AKA Deathstroke didn't really kill Ra's ah Ghul – it was just a fake Deathstroke intentionally using an old school costume and moniker to throw off the scent of their actual identity.

But now we know who was really behind the very public assassination, and it's a doozy for old-school DC fans...

In May 24's Robin #14 (opens in new tab), written by Joshua Williamson with pencils by Roger Cruz, inks by Norm Rapmund, colors by Luis Guerrero, and letters by Troy Peteri, the fake Deathstroke is revealed to be none other than Geo-Force, AKA Prince Brion Markov of Markovia. He gives Batman a choice: either hand over Ra's daughter and Damian's mother Talia to die, or they all die.

Geo-Force has a long history with Batman and Deathstroke. As a former member of Batman's personal team the Outsiders, Geo-Force was once a close ally of the Dark Knight. During the course of a team-up between the Outsiders and the Teen Titans, Geo-Force was reunited with his sister Terra, who became a member of the Titans in the landmark story 'The Judas Contract' (#8 on Newsarama's list of the best DC stories of all time.)

However, Terra was secretly a spy working for Deathstroke to infiltrate the Titans, resulting in a climactic battle between Deathstroke and the Titans in which Terra was killed. Geo-Force learned of Terra's death and her association with Deathstroke from Batman, and the betrayal rocked him to his core. 

In 'Shadow War,' Geo-Force seems less concerned with Deathstroke's actions than he is with Talia's, likely because hers are much fresher. At the beginning of the crossover, he's seen telling the media that he looks forward to