The actor is the son of the late businessman James Donald McConaughey, who died in 1992, and former schoolteacher Mary Kathleen McConaughey (née McCabe).
In his book, Matthew describes the heartbreaking moment his mother called him to announce his father’s death.
An excerpt from the book was featured in People magazine, which revealed when Matthew’s life changed forever.
He writes: “I got a call from my mother. “Your father is dead. My knees bent. I couldn’t believe it.
“It was my father. No one or nothing could kill him. Except mom.
“He always told me and my brothers, ‘Boys, when I go, I’ll make love to your mother.’ And that’s what happened. He had a heart attack in his prime.
Although the anecdote has been repeated in the past – on the Howard Stern Show – some fans have expressed concern that the intimate story may embarrass his mother.
One reviewer hit on Twitter, writing, “Isn’t that incredibly private? I had no reason to know. What does a grieving son do? Bringing her mother’s privacy into the news? What a classless loser.
Another asked, “Has his mother given him permission to share this with the public?”
Another Twitter user wrote: “A little bit of TMI [Too Much Information]. What a ass, “while another wrote,” what a dreadful thing to share. ”
Mirror Online has reached out to a representative for Matthew for comment.