In spring 1881, Sadie found Behan in bed with the wife of a friend and kicked him out, although she still used the Behan surname through the end of that summer. Wyatt, meanwhile, had a common-law relationship with Mattie Blaylock, herself a former prostitute. Modern researchers have found her listed as Earp's wife in the June 1880 census. She suffered from severe headaches and became addicted to laudanum, a commonly used opiate and painkiller, and later committed suicide. When Marcus learned that Stuart Lake had discovered the existence of Blaylock, she successfully demanded that he omit her from his book "I Married Wyatt Earp".