Brittany Maynard, the 29-year-old who said she had terminal brain cancer, took medication to end her life under Oregon's "Death with Dignity Act," advocacy group Compassion & Choices said Sunday.

"Brittany chose to make a well thought out and informed choice to Die With Dignity in the face of such a terrible, painful, and incurable illness," a post on her website said. "She moved to Oregon to pass away in a little yellow house she picked out in the beautiful city of Portland."

In a statement, Compassion & Choices, an end-of-life choice advocacy group that has been working closely with Maynard, said she "died as she intended -- peacefully in her bedroom, in the arms of her loved ones."

Maynard passed away Saturday, said the group, which released an official obituary.

The epitaph contained a final message from Maynard, who expressed a note of deep thanks to all of her supporters, whom she "sought out like water" during her life and illness.

"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," she said.

Maynard graduated from University of California, Berkeley, and earned a Masters in Education from University of California, Irvine, according to the obituary. She was a world traveler who volunteered at a local animal rescue organization before her diagnosis and lived 29 years of "generosity, compassion, education, travel, and humor," it said.

Maynard is survived by her husband and his family, her mother and stepfather.

"While she had longed for children of her own, she left this world with zero regrets on time spent, places been, or people she loved in her 29 years," the obituary said.

Maynard's story spread rapidly on social media as a video explaining her choice garnered more than 9 million views on YouTube.

She became a prominent spokeswoman for the "death with dignity" movement, which advocates that terminally ill patients be allowed to receive medication that will let them die on their own terms. She also became a lightning rod for criticism from people who oppose that approach.

"I quickly decided that death with dignity was the best option for me and my family," Maynard wrote in an opinion column for CNN explaining her choice. "We had to uproot from California to Oregon, because Oregon is one of only five states where death with dignity is authorized."

(CNN)