Sarika and Rinki's murderer

Do we know who killed Rinki and also what happened to Sarika?

I too would like to know what happened to sarika.
Wish she comes back.
I think mihika ought to know how it feels to have your hubby's ex around.
Maybe ishu can also learn a lesson or two from mihika,about dealing with your husband's ex.
Shags is boring of late.