Authorities say the man was found alive Wednesday afternoon near Cary's Black Creek Greenway with no identification.
According to police, the man died Thursday morning at WakeMed. Police believe it was from natural causes.
The man was wearing khaki pants, a green golf shirt and walking shoes. He had keys to a Lexus, a mailbox and two house keys.
If you have any information, you are asked to contact Cary police.
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