DULUTH, MN (KDAL) - Duluth Police are investigating a suspicious death.  A man in his 20's was found dead in the 700 block of North 24th Avenue West on Saturday afternoon.  The St. Louis County Medical Examiner's Office will be ruling on the cause and manner of death.  The name of the victim is being withheld as relatives are notified.  Anyone with information concerning this investigation is asked to call 911.