The boy needed a ventilator to breathe and was unable to see, hear or swallow, Reuters reported.
Charlie Gard’s death ended five months of legal battles.
A spokesman for Great Ormond Street Hospital said the facility “had tried absolutely everything” to accommodate the couple’s wishes, but added that “the risk of an unplanned and chaotic end to Charlie’s life (would have been) an unthinkable outcome for all concerned.”
The couple ended its legal battle on July 24, in what they called the “most painful of decisions,” and their son was moved to a hospice on July 27, the Daily Mail reported.
“Mummy and Daddy love you so much Charlie, we always have and we always will and we are so sorry that we couldn't save you,” Chris Gard said. “We had the chance but we weren't allowed to give you that chance. Sweet dreams baby. Sleep tight our beautiful little boy.'”