[JURIST] White House Deputy Chief of Staff and top advisor Karl Rove [Washington Post backgrounder] testified for a fourth and final time Friday before a grand jury investigating the leak of the identity of covert CIA agent Valerie Plame [Wikipedia profile] to the media in 2003. Rove emerged from the courthouse without comment, but sources close to the investigation indicate that he is not the target of the investigation and will likely avoid an indictment, although Special Counsel Patrick Fitzgerald [Washington Post profile] has not commented on whether he will file charges against Rove. Time Magazine reporter Matt Cooper reportedly told the grand jury in July that Rove and Vice President Dick Cheney's Chief of Staff I. Lewis "Scooter" Libby [official profile] served as his confidential sources for a story that revealed Plame's identity. AP has more.