Police say a man who drowned at an Ontario Place marina overnight reportedly dropped his phone into the lake and went into the water to retrieve it.

Firefighters were called to the south marina at Ontario Place shortly before midnight for a water rescue.

When they arrived on scene, a man was found in the water.

The victim, who is believed to be in his 20s, was pulled from the lake and rushed to hospital via emergency run in critical condition.

Police say he was pronounced dead in hospital a short time later.