A former Belle Vernon resident;Mary Irene Duwall;51;was killed instantly when the car she wsa driving collided with a truck at a crossroads on the Tamiami Trail highway in Florida. Miss Duwall;who was alone in the car;was traveling to Miami;Fla.;so spend the Christmas holidays with friends. She was killed only 17 miles from her destination. Miss Duwall lived at 316 Devon Drive;Birmingham;Ala.;and was a member of the staff of the University of Alabama;where she was associate profesor of psychology. She was graduated from Belle Vernon High School in 1934;Mt.Sinai School of Nursing at New York City and Peabody College at Nashville;Tenn. At the latter she received a Ph.D.in psychology. Miss Duwall was born in Rostraver Twp.;on Sept.21;1916. Surviving are her mother;Mrs.Sarah Rankin Vaughn;and her step-father;William E.Vaughn of Belle Vernon;four sisters;Jean Duwall of Pittsburgh;Mrs.Thomas (Phyllis) Smith of St.Louis;Mo.;Mrs.Alex (June) Sanders of North Royalton;Ohio;and Mrs.William (Peggy) Jolly of Fayette City;two brothers;John and James of Belle Vernon R.D.2. Friends are being received at the Harold R.Toner Funeral Home in Belle Vernon from 2 to 5 and 7 to 10 p.m. Service there Thursday;Dec.28;at 2 p.m. with the Rev.Allie Clayton;pastor of Rehoboth Church at Belle Vernon R.D.;officiating. Interment;Belle Vernon Cemetery. Harold R.Toner is funeral director.