Aaron Hernandez -- Domestic Incident with Fiancée in L.A. Area

Aaron Hernandez was involved in a domestic incident with his fiancée a year ago that sent cops racing to his rental home in a beachside community in L.A. ... TMZ has learned.

Law enforcement sources tell us Hernandez was renting a place in Hermosa Beach in June, 2012, when a neighbor called police to report a domestic disturbance -- "fighting" -- between the ex-Patriots star and his fiancée, Shayanna Jenkins inside his home.

We're told when police arrived, Jenkins said she was ok and didn't want to press charges so they left without making an arrest.

Law enforcement sources also tell us ... cops came to the house several other times after neighbors made noise complaints. One source says Hernandez "acted like an a**hole" when cops responded.

Our sources say Hernandez still has the rental home. Our law enforcement sources say so far ... cops have not obtained a warrant to search the apartment.