Eve Kosofsky Sedgwick, a prominent theorist who is often cited as one of the founders of queer theory, died on April 12. She was 58.

Sedgwick was reportedly diagnosed with breast cancer in 1991, prompting her book A Dialogue on Love. Sedgwick taught English at several institutions including Boston University; the University of California, Berkeley; and Duke University, where she was a Newman Ivey White Professor of English.

According to friend Cathy Davidson, who wrote about Sedgwick’s death on Monday, she died by her partner Hal’s side.

“Eve was a practicing Buddhist and blessings were said in Tibetan Buddhist ceremonies all over the world to help with her passage to the next life, a passage that, I know, brings the loving connections she made to the next life,” Davidson wrote. “She leaves those connections behind, to those of us fortunate to have known her or been touched by her writings. We love you, Eve.”

Sedgwick has written many books on gender and sexual orientation, including Between Men: English Literature and Male Homosocial Desire; Epistemology of the Closet; and Tendencies.