Psychopath Riddle: Can you figure it out?

[Lima]

I have a riddle for you.

A woman attends her sister's wedding. At the wedding she meets a charming man whom she "falls in love with" on the spot. Before she can get a number, she gets called away. After that, they never get a chance to chat again.

A week later, the bride is found dead. Her sister killed her. Why?
@Lili: Lol, yes...apparently figuring it out means you have the mindset of a psychopath. You got it wrong, but that's probably a good thing.

 

[Jack]

It was one of those CRAZY weddings.

 

[LiLi]

Is it because the woman fell in love with her sister's new husband, then she got jealous and killed her? Is this one of those things where you see if you're crazy or not?