Olympic gymnast Simone Biles' older brother is in police custody for the murders of 3 people ... after an 8-month investigation into a New Year's Eve tragedy.
Tevin Biles-Thomas was arrested Thursday at Fort Stewart in Georgia, where he is an active duty soldier in the Army. Police say Biles-Thomas opened fired on a group of people when a fight broke out during a New Year's Eve party at an Airbnb in Cleveland.
According to cops, an "uninvited" group of people had entered the house party and during the ensuing brawl .