Since their 2005 divorce, Shackelford claimed that she now has nothing, as Harvey also has full custody of their 15-year-old son, Wynton.
Now, the New York Times best-selling author's current wife has retained an attorney to fight the allegations that she was the other woman, something that she said has left her both "shocked and dismayed."
Marjorie is pursuing a lawsuit against Shackelford.
"As a wife and a mother, I cannot stand back and allow the defamation of my character or actions that will malign my family," the philanthropist said in a statement released through her attorney C. Anthony Mulrain, exclusively released to BlackVoices.com.
"So, I will do what I need to do to the greatest extent of the law."
Shackelford claimed she found e-mails and text messages between her 'Family Feud' talk show host ex-husband and Marjorie and that after she expressed a desire to get a divorce, he left and fled to New York City to be with Marjorie.