(1080 KRLD) – Friends of an Irving man, who was trapped after a sand dune caved-in, said he has died.

Police said Lee Goggin was digging a tunnel in the sand on the beach in Saint Augustine, Florida When the sand caved in.

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Personal trainer Lee Goggin of Irving shown here with his wife Courtney. He was a father of three. (photo courtesy: Facebook)

Goggin had a heart attack while buried. Friends said he suffered from swelling in the brain and was in a medically induced coma afterward before passing away.

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“He’s got a beautiful wife, three great kids… just a phenomenal guy. The world is definitely at a loss without him,” said longtime friend Joe Long.

Police said he was digging in an area marked “Do Not Enter”.​

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(© Copyright 2018 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.)