From 1886 to 1889, he served in the Georgia House of Representatives, and then was appointed by the Supreme Court of Georgia in 1893 as a member of the Commission to Recodify the Laws of Georgia, which prepared a code of laws for the state. Two years later, that code was adopted by the state General Assembly.
On January 1, 1901, Lamar was appointed to fill an unexpired term of Justice William A. Little in the Supreme Court of Georgia, then was re-elected in 1903. He wrote more than 200 opinions before resigning in 1905 to again practice law, defending railroads and many other large corporations.
At a reception after Woodrow Wilson's inauguration in 1913, the two friends were able to meet again and swapped stories of their Georgia youth. They remained in contact while they were in Washington.[6] In 1915, Lamar wrote two short individual opinions in the famed Leo Frank case. He declined to grant a petition for habeas corpus brought by Frank to challenge the fairness of his trial, but subsequently granted a writ of error allowing Frank to bring his claims before the court. The full Court went on to reject Frank's claim in Frank v. Mangum; Lamar voted with the majority but did not write a separate opinion.
Lamar, together with Frederick W. Lehmann, was selected in 1914 to represent the United States at the ABC Powers Conference convened to avert a war over the Veracruz Incident. In the fall of 1915, Lamar suffered a paralytic stroke. Legislation was proposed to allow Lamar to retire with full pay, but his death just months later made the issue a moot point.
He died in Washington, D.C., on January 2, 1916.[7]
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