PICKERING, Ont. - A 33-year-old woman is dead after trying to rescue her son during a weekend swim in Lake Ontario.

Durham Regional Police say the woman's six-year-old boy was on an inflatable raft in the lake near Pickering, Ont., when the wind blew him away from shore on Sunday afternoon.

They say the woman and three bystanders all swam out to try and bring him to safety.

While one man was able to rescue the child, they say the mother was unable to swim back and had to be helped to land.

She was taken to hospital and later pronounced dead.

Police identified her as a resident of Oshawa, Ont., but have not released her name.