William K. (Kenny) Fulcher, 66, a former Washington area jazz musician and a retired National Security Agency research analyst, and his wife, Esther M. Fulcher, 64, who also was a retired NSA research analyst, died June 30 in a traffic accident in Hamilton, Ontario.

A spokesman for the Ontario Provincial Police said the couple burned to death when the car in which they were riding was struck from behind by a tractor-trailer on Queen Elizabeth Highway, which runs from near Niagara Falls to Toronto.

The car burst into flames and the Fulchers were pronounced dead at the scene, police said. Their car was being driven by a grandson, Eric Freed, who escaped from the wreckage and was released after being treated overnight at a hospital, the spokesman said.

Mr. Fulcher was born in Roanoke and graduated from the National Business College there. He contracted infantile paralysis when he was 1 year old and walked on crutches all his life. He came to Washington around 1940 and worked for the old War Department before joining the National Security Agency. He retired in 1979.

An accomplished trumpet player, Mr. Fulcher played with semiprofessional groups in Roanoke and traveled about the South. He found work as a musician easy to get in Washington during World War II since many other musicians had been drafted. He played in bands at several hotels and night clubs.

During the 1950s and 1960s he played in a jazz group at the old Charles Hotel in Washington and later he worked with a Dixieland band called Southern Comfort in Rockville.

A former resident of Beltsville, he moved to Frederick, Md., about eight years ago, but he continued to play with groups in the Washington area until he had a stroke three years ago.

He was an officer in several organizations of handicapped persons.

Mrs. Fulcher was also born in Roanoke. She came to Washington in 1943 and later joined NSA as a research analyst. She retired in 1979.

Mr. and Mrs Fulcher are survived by one son, James K. Fulcher of Beltsville; two daughters, Gwen Freed of Upper Marlboro and Linda Hopkins of Severn, Md., and 11 grandchildren.

RAMESH N. VAISHNAV, 53, a professor of engineering at Catholic University since 1961, died July 1 at George Washington University after a heart attack.

Dr. Vaishnav, a resident of Gaithersburg, was born in India and earned a degree in civil engineering at Gujarat University there.

He came to the United States in the mid-1950s and earned a master's degree in engineering at the University of Michigan and a doctorate in theoretical and applied mechanics at the University of Illinois.

His specialties were solid mechanics, biomechanics and robotics, and he had done research on the flow of blood through large blood vessels.

Survivors include his wife, Marianne Pollick Vaishnav of Gaithersburg.