[HIGHLIGHTS] Author, who wrote books about grief, is said to have killed her own husband

Kouri Richins is said to have killed her husband with an overdose of fentanyl. She had mixed the drug into a "Moscow Mule" cocktail.

The 33-year-old mother of three sons, aged five, seven and nine, was arrested in early May. The book "Are You With Me?" was published almost exactly one year to the day after her husband's death. In the meantime, the book can no longer be found at U.S. online booksellers.