" He died doing something he loved , which was flying his helicopters , " said the father , who lives in Fairview Heights , just outside St. Louis , Mo .
" He died doing something he loved , " William Dusenbery , Sr. , who lives in Fairview Heights , just outside St. Louis , Mo .
Stony Brook University launched the study in 1996 , after earlier studies indicated a possible connection between electromagnetic fields and cancer .