Edward F. Bachner IV spent years prowling dark corners of the Internet, where he sought a hit man to carry out the "permanent retirement" of an unidentified woman, according to a federal complaint filed Tuesday. Bachner, who was accused this week of buying a dangerous pufferfish toxin, suggested in one e-mail that payment for the murder would be an AK-47 assault rifle and $8,000, the complaint alleges. "If we have an agreement, I can send you specific info that will get you within 5 yards of mark on . . . any weekday," Bachner wrote, according to the court record....