The deceased was identified as Mainul Islam,40, hailed from Gurkochi village of the upazila.
He succumbed to his injuries at the hospital around 8 am, hospital sources said.
With his death, three people died following the incident.
A fierce clash between some people of Gurkochi and Sitingbari villages of the upazila over grabbing a land left over 50 people injured on Monday.
Among the injured, Ataur Rahman of Sitingbari village and Moniruddin,46 of Gurkochi village died at the hospital on Monday and Tuesday respectively.