Oregon Attorney General John Kroger has announced that the Chief Counsel of the Criminal Justice Division has resigned. A statement issued by the Department of Justice says Sean Riddell deleted a large number of e-mails; mistakenly believing they were backed-up on computer tape.  Department spokesman Tony Green says Riddell will return to the agency after a leave of absence and work a different position. Green says some of the e-mails were recovered but would not say which to which case the e-mails may have been related. The Justice Department has been under scrutiny lately as details about a messy investigation of the Department of Energy have been revealed.