Police said the clash ensued between the supporters of independent chairman candidate Sultan Mahmud Khan and ruling Awami League candidate Abu Sayed Khan over pasting posters at Bhatara village on Saturday.
During the clash the rival groups exchanged gunfire, leaving Yasin and 12 others injured, said Masud Alam, additional superintendent of police in Pabna.
Yasin succumbed to his injuries on the way to Rajshahi Medical College, he said.
Nine of the injured were admitted to Pabna General Hospital. Six of them were later shifted to Rajshahi Medical College Hospital.