I am a volunteer researcher for the Texas Peace Officers Memorial. Southern Pacific Railroad night watchman (called Captain because he was captain of the watchmen in El Paso previously and detective) Richard "Dick" Elsbery (also referred to as J.L. in some accounts also with various spellings of last name) was shot and killed on 16 Aug 1895 in Valentine (Presidio Co at the time and now in Jeff Davis co) by two robbers. The case is well documented in Bob Alexander's book, Lawmen, Outlaws, and S.O.B.s. Volume II, Silver City, NM: 2007. I have a stack of newspaper articles also. Tom & S.L. HOLLAND were arrested but Tom's case was dismissed. S.L. was conviced of the robbery and acquitted of the murder. He was later retried and acquitted of the robbery.
You use John Luckie Elsberry which matches the J.L. references. I found a J.L. Elsberry as a detective for the Morriss Agency in Houston in 1889-1890. I could not find any family information on Elsberry, date of birth or place of burial. Any assistance would be appreciated.