
Police said Chakrit Chaladthanakij, a rescue worker, succumbed to death at the provincial hospital on Friday.
First victim of the explosion was a reporter of mass circulation Thai Rath newspaper, Charlee Boonsawat, who died on the scene when the bomb exploded on Thursday night.
The blast in front of the Sungai Golok police station also injured 32 others, including the district police chief and a television journalist.
The first blast, happened at about 9.30pm, drew officials, reporters and police to the scene. The first bomb did not cause any injuries.
As police and soldiers were cordoning the area, the second bomb exploded. Among the injured, five were seriously injured.
Sungai Golok police chief Col Prabpal Meemongkol was among the injured but his condition was not serious.
Others injured included a reporter from the Channel 9 television station, as well as police and soldiers.
The first bomb was planted on a motorcycle while the second bomb planted in a car nearby was triggered.
Charlee, the slain Thai Rath reporter had survived several bomb blasts in the past.
Security was intensified in Narathiwat and nearby provinces including Songkhla.