Brownsville teen pleads 'not guilty' to ex-girlfriend's murder

      Javier de la Rosa, Jr.

      A Brownsville teenager has pleaded 'not guilty' to the murder of his ex-girlfriend Tiffany Galvan.

      Javier de la Rosa appeared before Judge Benjamin Euresti with the 107th State District Court for an arraignment on Monday morning.

      A Cameron County grand jury indicted 16-year-old De la Rosa on capital murder charges.

      The 16-year-old is accused of stabbing his ex-girlfriend to death at Benavides Park near Browne Road in Brownsville.

      A passerby found Tiffany's body back in August.

      The 16-year-old will stand trial as an adult.

      He's being held at the Carrizalez-Rucker Detention Center in Olmito.

      De la Rosa played for the Lopez High School football team but his ex-girlfriend Tiffany Galvan was a student at Los Fresnos High School.

      A motive in the murder was not clear but investigators said the two met on an on-line social media network.