The change coincided with the switch from longtime editor Robert Kanigher (who had taken over writing for the character following the death of creator William Moulton Marston in 1947), to new editor Dennis O'Neil in Wonder Woman #178 (dated October 1968). According to the new writer/artist Mike Sekowsky, the reason for the change was: "[T]he sales on the old WW were so bad that the book was going to be dropped. The new Wonder Woman was given a chance -- (a last chance for the book) and it worked!" Diana Prince gave herself a "mod" makeover in order to go undercover when Trevor was accused of being a double-agent. The following issue, the Amazons claimed they needed to leave this world for another dimension in order to "renew their magic", and Diana renounced her powers and Wonder Woman identity in order to remain with Steve. Meanwhile, Steve Trevor was kidnapped by the evil Doctor Cyber, international terrorist. During this adventure, Diana Prince met and befriended blind martial arts expert I Ching, who trained her in Asian martial arts, which Diana as a trained Amazon quickly mastered. When one of Cyber's henchwomen killed Trevor (in issue 180), Diana transitioned into working with Ching to bring down Cyber. Other adventures included sword-and-sorcery missions, supernatural villains, fighting militia sects, and helping people in trouble. Diana left the military, opening a "mod" boutique in New York City. After rescuing runaway Cathy Perkins, who had been captured by a weird dominatrix gang, she hired Cathy to be her assistant and run the boutique when Diana was called away for adventures. One such adventure saw her being forced back into military service for one case. The non-powered Diana Prince era ended as abruptly as it had started when Kanigher returned as editor in Wonder Woman #204 (dated February 1973). A sniper terrorized New York City. He shot and killed a motorist, whose car crashed into a restaurant in which Diana and Ching were enjoying lunch. Ching was killed, and an enraged Diana set off to stop the sniper. Along the way, she suffered a head injury, and the dazed Diana started operating on subconscious urges that compelled her to steal a military aircraft and head for the Bermuda Triangle, where she crashed. When she woke up, she was suffering from amnesia, and she found herself on Paradise Island, where the Amazons restored as many of her