There's an old hoary plot device in TV cop shows where a guy "becomes" a serial killer and kills several people including the one person he really wants to see dead. He does this so that the police assume his "real" victim is simply a random victim of the serial killer.
Maybe Ray killed Sue, etc., so that when Jean was attacked, no one would suspect him, the ex-husband (typically a prime suspect in ANY murder case, especially when you consider he just signed half his patents over to her in issue one).
Ray then "rescued" Jean as a ploy to get her--and/or his patents--back.
