Old clue influences DNA test By DERRICK NUNNALLY and MIKE DUNNE Advocate staff writers Derrick Todd Lee became the chief suspect in the south Louisiana serial killings through the investigation of a disappearance not previously linked to the killer's five known victims, officials from several law enforcement agencies said. The body of Randi Mebruer, a Zachary woman police believe was abducted from her home in 1998, has never been found. But police believe she was killed because of the large amount of blood left in her home. An old tip about her disappearance led officials to recently get a court...