Ashton Kutcher has resigned from his position as chairman of the board of Thorn, an anti-child-sex-abuse organization he co-founded, in the wake of outrage over his letter of support for Danny Masterson.

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Kutcher and his wife Mila Kunis have been under fire following the sentencing of That 70s Show actor Danny Masterson earlier this month, who was convicted of raping two women in the early 2000s. Kutcher and Kunis submitted character letters on behalf of their former co-star, in which they both referred to him as a "role model."

Thorn is a nonprofit that combats child trafficking by developing new technologies and repurposing existing technologies to identify and locate victims. Kutcher is no longer listed under their board of directors on their website.

In his letter, the actor also apologized to "victims of sexual violence and everyone at Thorn who I hurt by what I did."

"The mission must always be the priority and I want to offer my heartfelt apology," Kutcher continued. "And to the broader advocacy community, I am deeply sorry. I remain proud of what we have accomplished in the past decade and will continue to support Thorn’s work. Thank you for your tireless advocacy and dedication to this cause."