Abhay Kurundkar had sent a text message to cover up the murder of his lover and fellow cop Ashwini Bidre-Gore, but instead his plan did a complete U-turn and backfired on him. The police realised that the cover-up message was sent by Abhay when they saw that he had written 'Y' instead of you, whereas Ashwini would always write 'U'.

Backstory
Abhay, a senior inspector with the Thane Rural police, had allegedly lured Ashwini away from her family with promises of marriage, but when she asked him to make good on the promise, he killed her. He, along with three others, was arrested by the Navi Mumbai police on the charge of abduction and murder. mid-day accessed the supplementary charge-sheet filed by the cops, which mentions how suspicion grew over Abhay's role.