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Paul McCartney pays tribute to brother-in-law's death: 'He was invincible'

Paul McCartney took to social media to pay tribute to his brother-in-law, John Eastman, who died of pancreatic cancer at the age of 83 on Tuesday.

The pair were linked personally because Eastman was not only the brother of McCartney's late wife Linda Eastman McCartney, but was also the former Beatles singer's longtime lawyer.

The musician shared heartfelt tributes on Instagram, honoring Eastman's role in his career and calling him a "hard to beat" friend. I mentioned that it is

"His sense of humor always shone through in everything he did. His devotion to his family was unparalleled," McCartney wrote.

Eastman had been by McCartney's side for more than 50 years of his life, representing the artist during the Beatles' infamous breakup. According to Eastman's biography of New York University.

Despite the death of the star's first wife, the two apparently remained close as a family. . The 80-year-old musician's admiration for his late friend was evident in his words:

"There is so much more to say about his incredible qualities, but his Words can hardly express our passion for life and our affection for this amazing man," McCartney wrote.

"He will be sorely missed, but will always be cherished in the hearts of those of us who knew and loved him."

25} NEW YORK, NY - OCTOBER 16: Jodie Eastman and John Eastman attend the NYSCF Gala & Science Fair at Jazz at Lincoln Center on October 16, 2017 in New York City. (Photo by Patrick McMullan/Patrick McMullan via Getty Images)
Patrick McMullan via Getty Images