During Shepley's time in Congress, he served as chairman of the Committee on Engrossed Bills (23rd and 24th Congresses). On October 28, 1836, Shepley became a justice of the Maine Supreme Court; in 1848 he was elevated to Chief Justice. He served on the Court until October 22, 1855 (he was not a candidate for renomination). The following year he was appointed as the sole commissioner to revise the public laws of Maine. Later he resumed practicing law. Sheply died in Portland and is interred in Evergreen Cemetery.
Shepley began practicing law in Saco, Maine (at the time, Maine was part of Massachusetts.) Shepley became a member of the Massachusetts General Court in 1819; the following year, he was a delegate to the Maine constitutional convention, which drew up the constitution for Maine when it became a state.
From 1821 until 1833, Shepley was the U.S. attorney for the District of Maine.
On October 28, 1836, Shepley became a justice of the Maine Supreme Court; in 1848 he was elevated to Chief Justice.
SHEPLEY, John, lawyer, born in Groton, Connecticut, 16 October, 1787; died in Saco, Maine, 9 February, 1857.
He was a member of the legislature in 1819, a delegate to the convention that framed the constitution of Maine in 1820, and United States district attorney for that state from 1821 till 1833.
After the inauguration of a civil governor of Louisiana, General Shepley was placed in command of the military district of eastern Virginia, became chief of staff to General Godfrey Weitzel, and for a short time during the absence of that officer commanded the 25th army corps.