Keehan first served aboard the U.S.S. Kensington from 2 January 1864 until he was attached to the Tecumseh on 20 April 1864 . He was reported lost with her during the Battle of Mobile Bay on 5 August 1864 as reported in Navy casualty lists,  and on his rendezvous index card.
He was approximately 25 years old and had been in the Navy for just over nine months.
Awards & Memorials
Alternate Spellings of NameName spelled as "James Kearn" in Navy Casualty Books: Officers and Enlisted Men (Volume 1), 1776-1885
References and Sources Return of the United States Naval Rendezvous, New York, NY for the week ending November 28, 1863
 NARA T1099. An index to rendezvous reports during the Civil War, 1861-1865.
 "Navy Gazette: List of Deaths in the Navy of the United States, reported to the Bureau of Medicine and Surgery, Navy Department, during the week ending December 3d, 1864." Army and Navy Journal, 10 Dec. 1864, p. 253.
 Officers and Enlisted Men who Died in the Active Service of the U.S. Navy 1776-1885