ST. AUGUSTINE, Fla. — Authorities in northeast Florida say they've closed the 24-year-old case of a missing seventh-grader, but the girl's mother says she doesn't believe it. Martha Jean Lambert vanished near her St. Augustine home on Nov. 27, 1985. Her mother, Margaret Pichon, says she remains convinced that the 12-year-old girl was kidnapped. However, the St. Johns County Sheriff's Office said Friday that Pichon's son David Lambert has confessed to accidentally killing his sister in an argument. Sgt. Chuck Mulligan said Lambert told police that he panicked and buried the girl in a shallow grave. Lambert was 15 at...