One of many sons of former actor and President of the USA Ronald Reagan, Michael Reagan, has died on the age of 80 … the Ronald Reagan Presidential Basis and Institute confirms to TMZ.

Michael died on Sunday, January 4, Newsmax studies … his reason for demise was not launched.

Michael Reagan, who was adopted, was Ronald’s oldest son … his mom was actress Jane Wyman — Ronald’s first spouse.

Michael was an creator of a number of books — together with “Classes My Father Taught Me” and “Twice Adopted” — a radio host and a lecture speaker on conservative politics.

Michael is survived by his spouse, two grownup daughters, and two half-siblings, Patti and Ron Jr., from Ronald’s second marriage to Nancy Reagan.