Sir Paul McCartney's brother-in-law John Eastman dies aged 83 after battling pancreatic cancer

Sir Paul McCartney's brother-in-law died aged 83 on Tuesday after a short fight with pancreatic cancer. John, who knew Paul for over 50 years, was the brother of Linda Eastman McCartney, The Beatles legend's first and famous wife who died in 1998. The singer, 80, paid tribute to the famed lawyer on Instagram on Thursday with a picture of the pair doing yoga poses. Tragic: Sir Paul McCartney's brother-in-law died aged 83 on Tuesday after a short fight with pancreatic cancer Paul wrote: 'My dear brother-in-law, John Eastman, has passed away. Having known each other for over 50 years it is an extremely sad time for me, and our families.' One of the nicest and smartest people I have had the good luck to have known in my life. Not only did he help me massively in my business dealings as my lawyer but as a friend he was hard to beat. 'His sense of humour always shone through in everything he did and his devotion to his family was supreme. We had so many fun times together through the years, but when the time came to be serious, he was unbeatable. Devastated: The singer, 80, paid tribute to the famed lawyer on Instagram on Thursday with a picture of the pair doing yoga poses Paul wrote: 'My dear brother-in-law, John Eastman, has passed away. Having known each other for over 50 years it is an extremely sad time for me, and our families.' He continued: 'There is so much more that can be said of his incredible qualities, but words can hardly describe his passion for life and our affection for this amazing man. 'He will be sorely missed but always held dear in the hearts of those of us who knew and loved him. Paul ended the touching post with a goodbye message: 'See ya Johnny! Family: John, who knew Paul (left) for over 50 years, was the brother of Linda Eastman McCartney (right), The Beatles legend's first and famous wife who died in 1998 Talented: John's father, Lee, was a well-know lawyer and trained his son to take over as Paul's music attorney John's father, Lee, was a well-know lawyer and trained his son to take over as Paul's music attorney. John steered Paul through the Beatles’ break up, his solo career, and all the ventures that have come through the years. Last year, the entertainment lawyer purchased a luxury penthouse overlooking Central Park in New York City for a whopping $26.5million (£21.7million), where he lived with his wife Jodie.