There was a noticeable police presence at the Grand Bend Marina on Friday morning.
In an e-mail to Sarnia News Today, Lambton OPP Community Engagement Officer Jeanine Robertson confirmed officers were investigating a sudden death.
"At this time, the death is not considered suspicious, and no foul play is suspected," Robertson said. "No further information will be released on this matter."
The Municipality of Lambton Shores said in a mid-morning post on Facebook the marina was closed.
OPP had cleared the scene by noon.