Tripti goes from Kyunki Saas Bhi Kabhi Bahu Thi

For so many years of the serial, Kyunki Saas Bhi Kabhi Bahu Thi, Tripti (Suvarna Jha) played the role of a bitter woman and then a bitter wife. A long time back, she swayed the vacillating and weak Sahil Virani into leaving his great wife Damini. Even though Damini Khanna / Virani was a devoted wife, Sahil started moving towards Tripti (who was also interested in moving to become a Virani). So, in the previous time installment of the serial (about 2 decades back), Sahil divorced Damini and married Tripti (shocking everybody in the house, but they had to accept Tripti since Sahil is the son of the house).
Over the period of the marriage, Tripti was bitter about Sahil's lack of success as compared to the stupendous success of Karan. She tried to goad Sahil to be more ambitious, but was mostly bitter. And then when Sahil met Damini again, Tripti was jealous and unsure of Sahi's intentions.
But all this pales into insignificance compared to what would happen next. Obviously, there was a need to evict Tripti from the serial, so suddenly she was shown to have a previous husband called Rishabh Malhotra; and in an increase of her bitterness, she also deviously managed to get all the property and assets signed over to her; and then she started showing her true colors. She started dictated all the things happening in the house, and behaving like an absolute horror. Part of this included taunting everybody in the house.
And then things moved fast again. A person is shown with a knife and who is moving around stealthily, and then Tripti is attacked. Even while she is recovering, she is pushed down the stairs and dies. And she leaves a statement written in blood that a Virani is responsible for her death. WHo is it ?

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