Donda and Kanye West by Jemal Countess/ Donda and Kanye West by Jemal Countess/

Kanye West's mother, Donda, died unexpectedly Saturday night following a cosmetic procedure. She was 58. The family has not disclosed what procedure she was undergoing or the cause of death, and "respectfully asks for privacy during this time of grief."

Donda was the inspiration for the song "Hey Mama" from Kanye's 2005 album Late Registration, and she was known to defend her son against the critics who accused him of writing misogynistic lyrics. This past May, she published the book Raising Kanye: Life Lessons from the Mother of a Hip-Hop Star.