Context : Alonzo Ridley, (June 3, 1826 -- March 25, 1909) was a 49er, trader, Indian agent, engineer, Undersheriff of Los Angeles County, Confederate Army officer from California, who led the Los Angeles Mounted Rifles on their epic march across the Southwestern deserts from California to Texas in 1861. 
Answer : 1909
When did Alonzo Ridley die?