I think all this is just kk's plan to trap niti and throw her out of the house. i think antra is not dead and she is helping kk to throw out of the house. I even think that inspector Revathy is not actually a inspector but Kk's frnd who is helping her.
I think niti had killed the goon for some reason and antra came to know about it and tried to kill even antra but kk saved her and may b she is living with revathy.
This can be proved that niti killed(or tried to kill) antra about which the doctor came to know and that is why she killed the doctor also(because her bangles were found near the doc's body)
I think kk wants to make niti mad by bringing antra in front of her(the way she did it with antra by bringing sharman)
I hope watever i am thinking comes true and everything becomes back to normal asap.
Plz post ur comments,views and opinionds towards my prediction.
Thank you
Priya