NEW YORK - A new book has claimed that late actor Robin Williams struggled to remember his lines as he unknowingly suffered from a brain disorder.

According to the New York Post, Dave Itzkoff’s new biography Robin seeks to answer the lingering puzzle over Williams’ chaotic life and sudden death. It reveals his final days from the eyes of some of his closest family and friends and admirers in Hollywood.

According to the book, while the Oscar-winning actor was filming "Night at the Museum: Secret of the Tomb", the third movie in the franchise, he was unable to remember his lines.

“He was sobbing in my arms at the end of every day. It was horrible. I said to his people, ‘I’m a make-up artist. I don’t have the capacity to deal with what’s happening to him’,” said Cheri Minns.

As per Williams’ third wife, Susan Schneider, the actor started complaining about a variety of symptoms that included trouble urinating, insomnia, loss of his sense of smell and a slight tremor in his left hand.

“It was like playing whack-a-mole. Which symptom is it this month? I thought, is my husband a hypochondriac? We’re chasing it and there’s no answers, and by now we’d tried everything,” shared Susan. She later wrote about her husband’s symptoms in a journal for Neurology. - Agencies