Education
He attended private schools, and was graduated from Bethany College, Virginia (now in West Virginia), in 1856. He studied law.
United States representative politician
He attended private schools, and was graduated from Bethany College, Virginia (now in West Virginia), in 1856. He studied law.
He was admitted to the bar in 1857 and commenced practice in Jefferson City, Missouri. He was appointed United States district attorney for the western district of Missouri by President Buchanan and served until his resignation in 1861. Enlisted as a private in the Missouri State Guard and was subsequently promoted to the rank of major.
He returned to Missouri when the command disbanded.
He served as captain of ordnance, Confederate States Army. He resumed the practice of law in Jefferson City, Missouri.
Lay was elected as a Democrat to the Forty-sixth Congress and served from March 4, 1879, until his death in Washington, District of Columbia, on December 8, 1879. He was interred in Woodlawn Cemetery, Jefferson City, Missouri.
He served as member of the State constitutional convention in 1875.