R&B legend Patti Labelle's minder has been acquitted of misdemeanour assault following a fight with a United States Military Academy cadet in Texas in 2011.

Bodyguard Efrem Holmes was accused of punching Richard King at a Bush Intercontinental Airport terminal after he allegedly verbally abused the singer and lashed out at her son, Zuri Edwards.

According to trial evidence, obtained by the Associated Press, the alleged victim in the fight had a blood-alcohol level over three times above the legal limit for intoxication in Texas.

In surveillance video footage, King appeared to approach a limousine, in which LaBelle was a passenger, and shout abuse at her. When Edwards attempted to intervene, King punched him, prompting Holmes to then hit King several times.

King filed a lawsuit against the singer and Holmes.