The victim has been identified as father of six Sundar Persad.
His arms and legs were said to be bound.
Mr. Persad went missing on Friday while plying his car for hire in Moruga.
A post mortem performed on Mr. Persad’s body revealed he died as a result of a heart attack.
Mr. Persad’s vehicle was found on Saturday with four occupants in Marabella.
Police said the suspects whose ages range from 25 to 37 were taken into custody and the car impounded.
Princess town police are said to be continuing investigations.