Stephanie Madoff Mack, the daughter-in-law of Bernie Madoff, says she blames the disgraced financier for her husband’s death.

Madoff Mack is the widow of Mark Madoff, who commited suicide two years after his father’s arrest for the largest Ponzi scheme in history, and the first Madoff family member to break her silence.

In exclusive interview with “20/20? anchor Chris Cuomo, she talks about marrying in to one of New York’s most powerful families, living through the public humiliation of Bernie Madoff’s financial crimes and coping with her husband’s suicide. She also reveals for the first time a letter Bernie Madoff sent to her from prison after her husband’s suicide.

Madoff and his brother Andrew were the ones who turned their father in to authorities.

Madoff Mack told Cuomo that if she saw her father-in-law today, she’d tell him “that I hold him fully responsible for killing my husband, and I’d spit in his face.”

Madoff Mack has written an autobiography,  ”The End Of Normal: A Wife’s Anguish, A Widow’s New Life.” It will be published by Blue Rider Press on October 20.

Watch the interview on “20/20? Friday at 10 p.m. ET and watch a preview below.