Eva Ortiz, known by her stage name Eva O, is an American guitarist, singer, songwriter and pioneer of the American Deathrock genre. Eva is best known for her contributions to Christian Death, along with founding bands such as Shadow Project and Super Heroines.

In 1981, Eva formed Super Heroines along with Sandra Ross and Del Mar Richardson. While performing with Super Heroines, Eva met Rozz Williams, whom invited her to provide backing vocals for Christian Death’s debut album Only Theatre of Pain. After the release of Only Theatre, Eva briefly joined Christian Death on tour in replacement of guitarist Rikk Agnew.

The following year, Super Heroines released their debut album, Cry for Help with their second album Souls That Save releasing in 1983.

In 1987, Super Heroines disbanded. Internal conflict led to Eva and Rozz relocating from Los Angeles to San Francisco, where they married. Following their marriage, Rozz and Eva formed Shadow Project and released their self titled album in 1991 and Dreams for the Dying the year after, during the Los Angeles riots.

In 1993, while working with Rozz’s reformation of Christian Death, Eva began a solo career, releasing her first album, Past Time that same year.

Shadow Project disbanded after Eva O and Paris Sadonis left the band to focus on Eva’s 1994 album Demons Fall for an Angel’s Kiss. Soon after the break up of Shadow Project, Rozz and Eva divorced.

Three years later, Shadow Project reunited and begin work on their third album From the Heart, but work was cut short on April 1st, 1998, after Rozz Williams took his own life. Nonetheless, the album released later that year.

Eva released Damnation (Ride the Madness) in 1999, followed by a brief hiatus going into the 2000’s. In 2005, Eva returned with her fourth studio album Damnation/Salvation, which served as a sequel to Damnation (Ride the Madness).

After another brief hiatus, Eva O signed to Cleopatra Records and released Eva O MDX1 Mental Mayhem in 2014. Four years later, she released The Rise of Eva O.

In 2026, Eva O, along with previous members of Christian Death reunited for a performance at the United Theater on Broadway in Los Angeles after the premiere of Nico B’s documentary, Rozz Williams: Romeo’s Distress.