Matangi Tonga reported the 40-year-old nightclub bouncer, 'Atonio Moeaki, beat 23-year-old Sione Feo Lau'i with a baseball bat after an altercation outside the Nauti Ruby nightclub.
The head injuries sustained by Dr Lau'i were found to have caused his death six days later.
It is the second murder conviction and life imprisonment imposed by Tonga's Supreme Court this year.
The first was for the double murder of Feng Sheng Pei and Su Jie Wen last year.
