Whitelaw was born on January 30, 1854, on a farm near
Lloyds, Virginia. In 1856 or 1859, he and his father moved to
Cape Girardeau, Missouri, though returned to Virginia in 1866. He was educated at private schools between
Tappahannock and
Staunton, then the
University of Michigan Law School. He was admitted to the bar in 1873, after which he commenced practice in Cape Girardeau. Whitelaw was a Democrat, In 1873, he was
city attorney of Cape Girardeau. From 1874 to 1878, he was prosecutor of
Cape Girardeau County. Following the death of politician
James P. Walker, he was elected to serve
Missouri's 14th district in the United States House of Representatives. He served from November 4, 1890, to March 3, 1891. He declined to run in the following election. and in the election, ran under three party tickets. He retired in 1927, moving to
Blodgett, Missouri, then to
Blytheville, Arkansas, in 1927 and 1934, respectively. He died on July 27, 1937, aged 83, at a hospital in Blytheville. He was buried at Lorimier Cemetery, in Cape Girardeau. ==References==