The document of his will - said to be dated February 14 2002 - allegedly leaves all his possessions, earnings and even his body to Matthew Roberts, who first wrote to Manson in 1997.
Manson, who died last week aged 83, is believed to have made $250,000 while in prison through merchandising rights to his image which has since been used on T-shirts and selling art he created.
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| Mr Roberts |
According to TMZ, also leaves his "exclusive music catalogue" to Mr Roberts.
It is believed Manson received 10 cents for every shirt sold featuring his image and the words 'Charlie Don't Surf' .
Manson's pen-pal Roberts, told TMZ he first wrote to Manson out of curiosity and after 50 unanswered letters he replied in 1997.
He said they progressed to phone calls and visits, and that he met Manson for the first time in 2002, and saw him for the last time on October 21, less than a month before his death.