Kelly resumes his role as colonel of his regiment as more senior officers return to the brigade. However, with the death of Colonel Richard Byrnes at the Battle of Cold Harbor in 1864, he again commands the brigade. At the age of 42, he dies during the Siege of Petersburg on June 16, 1864, when he is shot through the head while leading the Irish Brigade forward against Confederate earthworks. His body is recovered and sent back to New York for his funeral. He is buried in Calvary Cemetery in Woodside, Queens, New York.
Meagher is educated at Roman Catholicboarding schools. When he is eleven, his family sends him to the Jesuits at Clongowes Wood College in County Kildare. It is at Clongowes that he develops his skill of oratory, becoming at age 15 the youngest medalist of the Debating Society. After six years, he leaves Ireland for the first time, to study in Lancashire, England, at Stonyhurst College, also a Jesuit institution. He returns to Ireland in 1843, with undecided plans for a career in the Austrian army, a tradition among a number of Irish families.
Meagher becomes a member of the Young Ireland Party in 1845 and in 1847 is one of the founders of the Irish Confederation, dedicated to Irish independence. In 1848 he is involved, along with William Smith O’Brien, in an abortive attempt to mount an insurrection against English rule. Arrested for high treason, he is condemned to death, but his sentence is commuted to life imprisonment in Van Diemen’s Land, now Tasmania.
Meagher escapes in 1852 and makes his way to the United States. After a speaking tour of U.S. cities, he settles in New York City, studies law and is admitted to the bar in 1855. He soon becomes a leader of the Irish in New York and, from 1856, edits the Irish News.
At the close of the war, Meagher is appointed secretary of Montana Territory where, in the absence of a territorial governor, he serves as acting governor.
In the summer of 1867, Meagher travels to Fort Benton, Montana, to receive a shipment of guns and ammunition sent by General William Tecumseh Sherman for use by the Montana Militia. On the way to Fort Benton, the Missouri River terminus for steamboat travel, he falls ill and stops for six days to recuperate. When he reaches Fort Benton, he is reportedly still ill.
Sometime in the early evening of July 1, 1867, Meagher falls overboard from the steamboatG. A. Thompson, into the Missouri River. His body is never recovered. Some believe his death to be suspicious and many theories circulate about his death. Early theories included a claim that he was murdered by a Confederate soldier from the war, or by Native Americans. In 1913 a man claims to have carried out the murder of Meagher for the price of $8,000 but then recants. In the same vein, American journalist and novelist Timothy Egan, who publishes a biography of Meagher in 2016, claims Meagher may have been murdered by Montana political enemies or powerful and still active vigilantes. On the frontier men are quick to kill rather than adjudicate. A similar theory shown on Death Valley Days (1960) has him survive the assassination attempt because his aide had been mistakenly murdered when he accepted one of his trademark cigars, and Meagher uses his apparent death as leverage over his political opponents.
After the Battle of Pea Ridge, Kiernan insists on joining the fighting ranks, and in that capacity is seemingly appointed a Major in the 6th Missouri Volunteer Infantry. In May 1863 at Port Gibson, Mississippi, he is wounded in the left lung and left on the battlefield for dead. Recovered and imprisoned, he effects an escape back to Union forces and resigns his commission. On August 1, 1863, he is commissioned a Brigadier General of the United States Volunteers by President Abraham Lincoln, commanding a post at Miliken’s Bend on the Mississippi River. However, ill-health as a result of his battlefield wounds forces him to resign on February 3, 1864.
In May 1865 Kiernan gains a U.S. consular post at Chinkiang, China. He manages to make the trip there, but his health does not allow him to perform the duties. He returns to New York where he becomes an examining physician for the Bureau of Pensions, a position he holds until his death.
James Lawlor Kiernan dies on November 26, 1869. The official cause of death is “congestion of the lungs.” Perhaps he is killed by that Confederate ball that wounded him six years earlier. He is buried in Green-Wood Cemetery in Brooklyn, New York.