An overdose of stimulant drugs killed a wealthy man who called himself "Don Juan" in western Japan in May, but it remains a mystery how it occurred, police said Wednesday.Police in Wakayama Prefecture, who have been investigating the sudden death of Kosuke Nozaki, 77, as a possible murder, concluded his May 24 death was caused by acute stimulant intoxication, but there were no track marks or external injuries on his body.The police believe it is unlikely there was an intruder at his home in Tanabe when he died, estimated to have occurred at around 9 p.m.He was found collapsed an hour and a …READ FULL ARTICLE