And Rove thought kidney stones were painful

Seems that Karl just remembered something he forgot to tell Fitzgerald the first time he testified.

WASHINGTON - Federal prosecutors have accepted an offer from presidential adviser Karl Rove to give 11th-hour testimony in the case of a CIA officer's leaked identity but have warned they cannot guarantee he won't be indicted, according to people directly familiar with the investigation.

[...]

The U.S. attorney's manual requires prosecutors not to bring witnesses before a grand jury if there is a possibility of future criminal charges unless they are notified in advance that their grand jury testimony can be used against them in a later indictment.

Rove has already made at least three grand jury appearances and his return at this late stage in the investigation is unusual.

The prosecutor did not give Rove similar warnings before his earlier grand jury appearances.