Lyle Menendez and his wife, Rebecca Sneed, quietly ended their marriage after more than 21 years together, but she remains a key figure in his life despite rumors of a cheating scandal Sneed says are baseless, PEOPLE has learned.

The couple tied the knot in 2003 while Menendez was serving time for the 1989 murders of his and his brother Erik's parents.

Lyle Menendez, 56, is just moving on fast from behind bars. The infamous prisoner, who was convicted in 1996 alongside his brother, Erik Menendez, for the 1989 double murders of their parents, Jose and Kitty Menendez,

Lyle Menendez and his wife Rebecca Sneed announced their separation on Nov. 21, over 20 years after they first wed

Rebecca Sneed, the wife of convicted murderer Lyle Menendez, has confirmed that the couple has been separated for some time. In a Facebook post on Friday, Sneed clarified that while they are no longer together, they continue to maintain a close relationship, referring to themselves as "best friends and family."

LOS ANGELES - Rebecca Sneed, the wife of Lyle Menendez, is revealing the status of her marriage to the convicted killer. In a social media post, Sneed announced she and Menendez are separated, but emphasized that the two remain "best friends and family.