Dominic S. Toffolo, 64, a branch chief and electrical engineer at the Naval Sea Systems Command, died of cancer Dec. 4 at the Greater Southeast Community Hospital.

Mr. Toffolo, who lived in Hillcrest Heights, was born in Detroit and attended Wayne State University. He moved to Washington in 1938 and graduated from George Washington University. He later did graduate work in physics at Catholic University.

During World War II, he served in the Navy. He then went to work at the Naval Research Laboratory. From the early 1970s until his death, he was at the Naval Sea Systems Command where he headed the electrical propulsion and generator branch of the electrical equipment divison. He also was a consultant on deep sea submergent rescue vehicles.

Mr. Toffolo wrote numerous papers for technical publications and held six patents. In 1979, he received the Professional Development Award from the Naval Sea Systems Command for advances in electrical propulsion and cryogenic technology. In 1980, he received the Professional Achievement Award from the Association of Scientists and Engineers.

He was a lector at Holy Family Catholic Church in Hillcrest Heights and a member of its choir and the Holy Name Society. He was a chess player and had been active in bowling and bridge.

Survivors include his wife, Dorothy, of Hillcrest Heights; two sons, Christopher, of Hillcrest Heights, and Anthony, of Greenbelt; two daughters, Regina, of Hyattsville, and Elizabeth Cresce of Bowie; a sister, Irene Palombit of Detroit, and two grandchildren.