A Monday afternoon explosion at an apartment complex in Beaver Dam has left one resident dead.  Emergency responders were called to the Village Glen Apartments at about 1:00 P-M.  The state Fire Marshal is helping with the case.  Investigators say a victim is a man in his late 20s or early 30s.  No other injuries were caused, but residents weren’t allowed to return to their homes.  They say “undetermined” chemicals were found inside the apartment and the source of the blast.