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 wife of convicted killer Lyle Menendez slammed the decision to delay a resentencing hearing for her husband and his brother Erik Menendez until late January. “Tomorrow will be the guys’ 35th Thanksgiving in prison. Next month will be their 35th Christmas in prison,” Rebecca Sneed wrote Wednesday on a Facebook page dedicated to Lyle.

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

Lyle Menendez is reportedly now dating a 21-year-old British college student after ending his more than two-decade-long marriage to Rebecca Sneed.

Lyle Menendez and his second wife, Rebecca Sneed, have separated after 21 years of marriage. The 56-year-old, who is currently serving a life sentence in prison alongside brother Erik Menendez after being convicted of killing their parents in 1989,

Lyle Menendez’s wife Rebecca Sneed announced she and the 56-year-old—in prison for murdering his parents—are separated. The news comes amid possible resentencing for Lyle and brother Erik.

Lyle Menendez, a focus of "Monsters" season two, was first married to Anna Eriksson. They divorced and he later married Rebecca Sneed.

Lyle Menendez’s estranged wife, Rebecca Sneed, clarified that his involvement with a 21-year-old woman is “not a cheating scandal.” “Lyle and I have been separated for a while now but remain best friends and family,