Rocky Stanley the stepson of "Gypsy Sisters" star Nettie Stanley -- was stabbed to death Monday night after an altercation in the parking lot of a YMCA. 

According to Kingsport PD in Tennessee, 22-year-old Rocky (whose real name is Huey) was involved in a fight over a basketball game. He was rushed to the hospital with multiple stab wounds and died a short time later.

Police recovered the murder weapon and were able to ID a suspect, Zachary Morris Gardner ... who turned himself in to police Tuesday morning. He was arrested for first degree murder.  

Rocky never appeared on "Gypsy Sisters" -- but Nettie and his father star on the TLC reality show.

Read more: http://www.tmz.com/2015/03/31/gypsy-sisters-rocky-stanley-dead-stabbed/#ixzz3VyoVCNm7