Claim: William McKinley served as a US president from March 4, 1887 until his death.
Evidence: William McKinley Jr. -LRB- January 29 , 1843 -- September 14 , 1901 -RRB- was an American politician and lawyer who served as the 25th President of the United States from March 4 , 1897 until his assassination in September 1901 , six months into his second term.