LORENZO, JOHN JR., 54, of St. Petersburg, died Saturday (Feb. 21, 1998). Born in Bronx, N.Y., he came here in 1983 from Bridgeport, Conn. He was sales manager for a paint company and was an Army veteran of the Vietnam War. Survivors include his wife, Barbara; three sons, Army Cpl. Arthur J., Fort Hood, Texas, and Michael F. and John III, both of St. Petersburg; his mother, Adeline Lorenzo, and a brother, Louis, both of Bridgeport; his twin sister, Madeline Prokop, Trumbull, Conn.; and many nieces and nephews.