Central Coast man's mysterious death being treated as murder

Police are treating the death of a young man on the NSW Central Coast as a possible murder but it's still unclear how he died.

Jayden Mason, 21, was found on the side of a road with severe head injuries just moments after being kicked out of the Wyong Leagues Club on Saturday night.

Several witnesses were interviewed and cars were seized on Monday as police tried to establish whether Mr Mason was bashed or hit by a car.

Acting Superintendent Dave Waddell said police were looking into whether the 21-year-old's death was related to several fights at the club, which was about 500 metres from where he was found.

It's believed Jayden Mason suffered severe head injuries just moments after being kicked out of the Wyong Leagues Club on Saturday night. Source: 7 News

Mr Mason was lying unconscious in the middle of a main road in Lake Haven when a passer-by spotted him about 10.30pm. Source: 7 News

"We believe (Jayden) left the Leagues club and then sustained those injuries a short time later but exactly what happened is still under investigation," he said.

Mr Mason was lying unconscious in the middle of a main road in Lake Haven when a passer-by spotted him about 10.30pm.

He was treated at the scene and taken to John Hunter Hospital, but his family made the heart-breaking decision to switch his life support off on Sunday after realising the extent of his brain damage.

A post-mortem on Wednesday will determine how he was killed.

"The homicide unit is involved but the exact nature as to how the injuries were sustained is still under investigation," Supt Waddell said.

Tributes have flown in for the the 21-year-old since his parents made the heartbreaking decision to turn off his life support. Source: 7 News

Police are reviewing the club's CCTV footage, and have appealed for information.

The young man's family is struggling to come to terms with his tragic death.

His friends have paid tribute to him as "one of the greatest people" they knew.

"I love you forever Maso, thank you for all the memories growing up," a friend wrote on Facebook.

"You will never be forgotten. You will live forever in our hearts."

Today's top news headlines - June 27