Police have seized a truck as they investigate a suspected hit-and-run that left a man dead west of Brisbane.


The 27-year-old man’s body was found on the Warrego Highway at Helidon early on Sunday.


Police suspect the young man left a party in Toowoomba in the early hours of the morning and was walking along the side of the highway towards Helidon, about 20 kilometres away, when he was killed.


Investigators are interviewing a truck driver and the driver’s vehicle had been seized.


No charges have been laid.


- with AAP