Doctor Anurak Amornphetsathaporn, the director of the Emergency Public Health Service Office of the Public Health Ministry, said Natchaya Rosungnern died a the Rayong Hospital at 2:20 pm.
The girl was injured by a bomb fragment and has become brain dead before she succumbed to injuries.
She was the second slain victim of the attack against the rally of the People’s Democratic Reform Committee in Khao Saming district in Trat Saturday night.
The first victim, also a five-year-old girl, was pronounced dead Sunday.
Apart from the two girls, 33 other people were injured in the attack.