 On October 13, 2015, Governor Jack Markell nominated Montgomery–Reeves to the Delaware Court of Chancery to succeed Vice–Chancellor Vice Chancellor Donald F. Parsons Jr..

On October 24, 2019, Governor John Carney announced the nomination of Tamika Montgomery–Reeves to be an Associate Justice of the Delaware Supreme Court, to the fill vacancy left by the elevation of Collins J. Seitz Jr. to be Chief Justice.On November 7, 2019, her nomination was confirmed by the Delaware Senate.She is the first African-American Justice.