Police see mystery writer MELBOURNE, Monday. —Homicide detectives investigating the murders of Abina Madill, 16, and Gary Heywood, 18, are checking information given to them yesterday by an anonymous man. The man met detectives secretly in Melbourne yesterday. He had written four letters to them previously claiming he had valuable information on the murders. Detectives refused today to identify the man or disclose what he had told them. The man claimed in the letters that a number of young men at a Shepparton works could give vital information in connection with the teenagers' deaths. The Shepparton youngsters were found dead near East Murchison on February 26 — 16 days after their disappearance.