A Michigan father and his 4-year-old son died Monday morning after falling through thin ice while fishing on a lake, and a witness reportedly says the dad tried and failed to save his son.

Authorities are investigating exactly how they fell, but believe that at some point the boy got cold and the two started to make their way off Alderman Lake in Highland, Mich.

"The traverse out was fine, fishing was fine, but the ice has pockets and flows, that’s that we think happened," Oakland County Sheriff Michael Bouchard told Fox2Detroit.com.

Two other fishermen were nearby and said they watched the two fall in. One of the witnesses believes the father went in after his son, DetroitNews.com reported.

The two were identified as David Lyons, 30, and his son Jackson. They were in the water for less than 10 minutes. They were pronounced dead after being rushed to nearby Huron Valley-Sinai Hospital.

Friends and family were in disbelief and remembered David for his generosity. He worked at a barbershop and would often go to people's homes, giving free haircuts if they couldn't afford them.

Authorities reiterated the risks of fishing on a frozen lake when temperatures are in the 40s. 

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