Endy Paulus died on the spot due to serious injuries to his head, said District Police Chief DSP Robert Salisip @ David.
According to him, Endy who was driving the vehicle was on the way home after going for a swim at Sungai Bunsit together with his younger brother, a relative and friends.
He lost control of the vehicle while approaching a corner and was thrown out of the vehicle upon overturning.
The four passengers treated for light injuries were Endry Paulus, 24, Majiddin Paulus, 25, Mazari Saidi and Cyril Philip.
The case is being investigated under Section 41(1) of the Road Transport Act.