Who Killed Cristal McIver?

My notes for that plot ....

This is basically going to be the Twin Peaks plot of the campaign. Cristal planned to bring Roy back, aided by Andy (magic) and Peter (arranging things in the club so she could make the ritual space). And then she died. Possibly murder, even though it’s somehow been arranged to look like suicide. [Of course, one PC knows she did it and another player knows OOCly but that’ll just add to the fun of it.]
Fact: Cristal is dead, and planned to bring Roy back.
Fact: someone made it out to be suicide.
Fact: Ike is certain someone tampered with the ‘information’ at the scene
Fact: Cristal had John (whose parents own Solomon Security Solusions) disable the cameras and such at her home last year, so parties could be more .... interesting.

[Theories, arranged by Ike from most-least likely]
Conjecture: Andy (who has used magic to try and kill Brodie) blames her for his failure(s), kiilled her.
Conjecture: Peter was sick of being second-place to Roy.
Conjecture: Harley killed her because Peter would be heart-broken and he’d get the club.
Conjecture: Brodie killed her, because all of this was her fault.
Conjecture: Matt has gone nuts because of the angel. Maybe crazy enough to kill the person responsible for it.
Conjecture: Rei killed her because she doesn’t want her brother back (or to protect Roy)
Conjecture: John supplied Harley with the info. about the cameras and such. John is a privacy-nut who hates his parents business and spies; perhaps unstable enough to kill Cristal himself
Conjecture: Her parents hired ninjas to kill her because she spent too much money.
Conjecture: Joni, or any other Popular Girl, did it out of spite that Cristal achieved her status via wealth.
Conjecture: The Coven wanted info on Andy/the rituals Cristal learned and went too far. (Other magicians could fall under this, or people trying to prevent Cristal from doing the Necromancy Ritual again.) And yeah, this one includes Ike himself.
Conjecture: Depending on her influence on the kendo club, the fencing club seeking students may have tried to prevent the kendo club from expanding itself, which is possible thanks to money Kevin got them. Taken to a further extreme, Kevin figured this might happen and arranged her death via proxy.
Conjecture: It *was* suicide, and someone is trying to make that it could have been murder. Parents, possibly for insurance.
Conjecture: Roy killed her for daring to attempt to bind his awesomeness.