An Islip man was found guilty Monday in the murder of his high school friend.

A Suffolk jury convicted Thomas Liming of murdering Kyle Underhill.

The body of Underhill, who was 18, was found four years ago under a piece of plywood in an Islip creek.

Prosecutors say Liming bludgeoned and choked Underhill, who was then buried alive.

Liming claimed he was defending himself.