J.B.C. Lucas of 4495 West Pine Boulevard, a member of one of the oldest families in St. Louis, is so ill at his summer home in Normandy that he has not yet been informed of the death of his 5-year-old daughter, Emily, on Monday, nor of the critical condition of his other daughter, Mrs. Frank Sawyer of Anderson, Ind., and his nephew, Henry Lucas Jr.Henry Lucas Jr. was operated on for appendicitis...Mrs. Sawyer is seriously ill with typhoid fever...Emily Lucas died at the Mullanphy Hospital Monday, following an operation for appendicitis.Mr. Lucas, the elder, is ill as the result of an operation for appendicitis. He has been operated on thrice within a year, and on account of his age there is thought to be but little chance for his recovery.
-Dallas Morning News, August 6, 1908
According to the physicians attending him, Lucas could not stand the shock of his little daughter's death nor the news of the illness of his other daughter and his nephew...John B.C. Lucas is a representative of one of the richest St. Louis families. He is the president of the Wellson, Mo., Bank, and is officer and director of a score of St. Louis mercantile concerns and financial institutions.His summer home in Normandy, St. Louis county, is regarded as not only the finest in the county but is one of the finest in the entire West. The town residence on West Pine Boulevard is a mansion. It tops the hill overlooking St. Louis's finest residence section.Lucas's condition took a change for the worse today...Mr. Lucas's first wife was Mary C. Morton, said to be related to Paul Morton, head of the Equitable Life. When she died Lucas married her sister Isabella, who is the mother of Emily.
-Evening News [San Jose, Ca.], August 20, 1908
The best information I've found has Lucas passing away in September of 1908.