In 1882, Delaney was elected Springfield city attorney; a couple of years later he was elected Greene County Prosecutor, a position he held from 1885-85. In 1888, he was appointed United States district attorney for the western district of Missouri. He also practiced law in partnership with his father-in-law from 1885-1890.
Delaney was deeply involved in politics and in 1890 he was elected a committeeman for the thirteenth district at the Democratic state convention. He even took his son “Jammie” with him to a central committee meeting later that year in St. Louis.
The Delaney’s first child, Robert Boyd, was born May 18, 1890, and lived only three days. Their second, James Boyd, born in 1882 and died in 1921 of tuberculosis.
The Graham murder wasn’t the only high-profile case Delaney was involved in. While George, Emma, and Cora were incarcerated in Greene and Polk counties, Delaney was the defense attorney for the Bald Knobbers in Christian County.
“Col. S. H. Boyd and Thos. J. Delaney have returned from Jefferson City, where they had been to secure a respite for the condemned Bald-Knobbers…a respite of 60 days has been granted and after the expiration of that period a commutation of sentence will be asked.”
“T. J. Delaney is an all-round lawyer, capable and resourceful in every field of legal controversy. He is really a brilliant attorney, eloquent and attractive as a speaker and resolute, vigilant and tireless in the trial of a case. He never loses a cause for lack of energy and tact. He is naturally aggressive and courageous. He gets close to his client’s personal standpoint and enters the court room as a veritable champion of the litigant represented. There is an air of chivalry about this attorney and his bearing in an important cause suggests the memories of a more romantic period in the history of society. Mr. Delaney is a well-read lawyer. He is at home with the poets and can command the choicest sentiments of many classical writers when gems of literature are needed to adorn a speech. His personal magnetism makes him a great favorite with juries and to this source of power the popular attorney owes much of his success.”
In 1911, Delaney received the Democratic nomination for judge of the Missouri supreme court.
In addition to his legal practice and political aspirations, Delaney was also involved in real estate and helped establish Delaney, Gooffe and Bouslog’s addition in North Springfield.
Thomas J. Delaney died February 1, 1920, at the age of 60. Cordie survived him eight years.
 Missouri Digital Heritage. “Missouri Death Records, 1910-1967.” According to the Pictorial and Genealogical Record of Greene County, Missouri, Delaney was born in New Orleans. Newspaper reports indicate that his mother lived in New Orleans, at least in 1889-1890.
 Family Search. Missouri Marriages, 1750-1920.
 Pictorial and Genealogical Record of Greene County, Missouri, 311-12.
 Springfield Leader, June 11, 1890.
 Springfield Leader, August 30, 1890.
 Missouri Digital Heritage. “Missouri Death Records, 1910-1967.”
 Springfield Leader, February 11, 1889.
 Springfield Leader and Press, December 28, 1899.
 Springfield Republican, September 12, 1911.
 Springfield Leader, March 5, 1887.