A 200 pound, 34 year old Springfield man shot to death when he apparently came charging at a police officer...and the officer - fearing for his life shot and killed him. Happened on Mill Street when neighbors called police for a report of a crazed man.  Police arrived at 128 Mill Street...and an altercation developed between 34 year old David Kingsbury and when he charged police with a knife the man was shot and killed. The officers, unhurt and unidentified will be put on administrative leave pending an investigation.