A well-known Manhattan clinical psychologist and author who was a vocal champion of women and animals hanged herself inside her Sutton Place home, authorities said Thursday.

Stacey Radin, 52, was discovered by her husband inside the bathroom of their fifth-floor apartment on Sutton Place near East 58th Street around 10:45 p.m. Wednesday, law enforcement sources told The Post. She was pronounced dead at the scene.

Radin left “multiple notes behind,” a law enforcement source said, and no criminality was suspected in the death.

“She has a history of depression,” the source added.

Radin founded Unleashed, a program designed to empower young women through advocating for social justice issues such as animal welfare and rights, in 2011 and was featured in a Post story about her work in 2014.

She authored “Brave Girls: Raising Young Women with Passion and Purpose to Become Powerful Leaders” in 2015. The book “looks at the world for 51 [percent] of our population from a cultural, social, psychological and developmental perspective and provokes readers to think deeply about what cultural shift must happen to achieve true equality,” according to her LinkedIn page.

Radin discussed the topic of severe depression in a January 2017 article in Tonic.

“Understanding the guilt and shame is helpful,” she said. “As is surrounding yourself with others who can be objective and reflective and offer a voice of reason when you are questioning your own ability to push through and accept the circumstances surrounding the diagnosis.”