Brittany Maynard, who moved to Oregon to use the Death with Dignity act, died Saturday in her home in Portland, the nonprofit Compassion & Choices confirmed Sunday.

Maynard, 29, was diagnosed with a grade four glioblastoma, a highly malignant and aggressive form of brain tumor. After being told she had six months to live, she moved to Portland from California this summer.

As Maynard's symptoms worsened, she chose to end her life by taking "aid-in-dying" medication she had received months before. Maynard had suffered from seizures and severe head and neck pain, the agency said.

"She died as she intended – peacefully in her bedroom, in the arms of her loved ones," the statement reads.

Compassion & Choices posted to its website Maynard's obituary, which includes her husband, Daniel Diaz, and her mother and stepfather among surviving family members. The agency had been working with Maynard and her family.

"In the face of such terminal illness and pain, Brittany chose to live each day fully, traveled, and kept as physically active and busy as she possibly could," the obituary reads. "In this final message, she wanted to express a note of deep thanks to all her beautiful, smart, wonderful, supportive friends.

"It is people who pause to appreciate life and give thanks who are happiest. If we change our thoughts, we change our world! Love and peace to you all," the obit quoted from Maynard.

People Magazine reported that Maynard posted a farewell message on Facebook before taking her own life. People reporter Nicole Weisensee Egan had previously written a cover profile on Maynard for People's Oct. 27 issue.

"Goodbye to all my dear friends and family that I love. Today is the day I have chosen to pass away with dignity in the face of my terminal illness, this terrible brain cancer that has taken so much from me ... but would have taken so much more," Maynard says in the post.

Friends and family had also posted their goodbyes on Facebook on Sunday.

Summer Holmes-Phillips and her sister, Erica Holmes-Kremitzki, posted on their Facebook page that their "aunt, uncle, and Dan" had said goodbye to Brittany.

"She will live on in our hearts and I will continue to share her message, just as I promised her I would," posted Holmes-Kremitzki. "Fly with the angels, Brittany. I know you'll watch over us all."

Maynard had been chronicling her decision to move to Oregon for the Death with Dignity Act in a series of videos released online with help from Compassion & Choices. Oregon's Death with Dignity Act was enacted in late 1997, and allows those who are terminally ill to end their lives through lethal medication prescribed by a doctor for that use.

Agency spokesman Sean Crowley said earlier Sunday afternoon that Maynard "is educating a whole new generation on this issue."

"She is the most natural spokesperson I have ever heard in my life," he said. "The clarity of her message is amazing. She is getting people to consider this issue who haven't thought of it before. She's a teacher by trade, and she's teaching the world."

--Laura Frazier

Janet Eastman of the Oregonian contributed to reporting