What I think about is that maybe by the time she got married to Adler, she tried to meet up with Killian. Well, Killian doesn't like her so that's enough to be a reason to kill her. And Killian is quite the opposite of Adler, that why by that time he can throw the crime and point it to Adler making him the prime suspect. ┑( ̄Д  ̄)┍
What I think about is that maybe by the time she got married to Adler, she tried to meet up with Killian. Well, Killian doesn't like her so that's enough to be a reason to kill her. And Killian is quite the opposite of Adler, that why by that time he can throw the crime and point it to Adler making him the prime suspect. ┑( ̄Д  ̄)┍