A new book claims that Robert Kennedy stole the remnants of his brother’s brain, after an autopsy was performed on the assassinated President.

The new claim comes just weeks before the 50th anniversary of John F. Kennedy’s assassination on November 22.

After the fatal shooting in Dallas, President Kennedy’s remains were flown to Washington, where an autopsy was conducted at Bethesda Naval Hospital.

His brain was stored in a stainless steel container with a screw top lid, which was then understood to be moved to a Secret Service facility.

It is understood the steel container was then placed in a footlocker before being transported to the National Archives.

Author James Swanson, who wrote ‘End Of Days: The Assassination Of John F. Kennedy’, told The New York Post that it was "placed in a secure room designated for the use of JFK’s devoted former secretary, Evelyn Lincoln, while she organized his presidential papers.”

Almost three years later, it was discovered the brain was missing.

“In October 1966, it was discovered that the brain, the tissue slides and other autopsy materials were missing — and they have never been seen since,' Swanson told the Post.

The author says his investigation lead him to believe that the then-Attorney General Robert Kennedy took the brain with the help of his secretary.

Swanson writes that RFK took his brother’s JFK’s brain, in a bid to prevent disclosures about the medication he was taking when he died.

“My conclusion is that Robert Kennedy did take his brother’s brain — not to conceal evidence of a conspiracy but perhaps to conceal evidence of the true extent of President Kennedy’s illnesses, or perhaps to conceal evidence of the number of medications that President Kennedy was taking,”

This book is one of many that are being released prior to the 50th anniversary of President Kennedy's death on November 22, 1966.