Walker Whiteside died on August 17, 1942, at his family residence in Hastings-on-Hudson, a village in the town of Greenburgh, New York, just a few miles north of New York City. He never recovered from a stroke suffered three years earlier. Leila Whiteside died at Hastings-on-Hudson on January 3, 1944, after a short illness. Leila, as did her husband, had taken to the stage at an early age debuting in the play Alabama (1888) at the age of sixteen. She had been a member of Augustine Daly’s stock company for a number of seasons before joining her husband as a co-star in Shakespearean productions throughout much of the 1890s. She retired from the stage after a fifteen-year career.