A Camden man was seriously injured Thursday night when he lost control of his snowmobile on Whiskey Island Road in the town of Camden, state police said.

Joseph Beadle, 52, was partially ejected from his sled after hitting a tree at about 7:30 p.m. and became pinned between the tree and the snowmobile, police said. He was not wearing a helmet and suffered head trauma as a result, they said.

Beadle was taken to SUNY Upstate Medical Center in Syracuse were he was listed in critical condition, police said.

An investigation is ongoing.