A Missouri court is all shook up following the resignation of a judge who was disciplined for wearing an Elvis Presley wig in court and occasionally playing the singer's songs during proceedings.

Matthew EP Thornhill, the longest-serving circuit judge in St Charles County, is a self-described Elvis lover, according to his biography page.

But his love for the King of Rock'n'Roll contributed to a disciplinary commission demanding his suspension, citing his frequent "irrelevant" Elvis references in court.

In a letter explaining his actions, Judge Thornhill said his aim was "to add levity at times when I thought it would help relax litigants".

"I now recognize that this could affect the integrity and solemnity of the proceedings," Judge Thornhill wrote in a letter dated 12 November to the Missouri Supreme Court.