Khoon Ki Holi

Two deaths at a Holi party Vijay an accountant and the party decorator. Vijay and his wife go to Vijay's boss's Holi party but soon after Vijay collapses and dies. The guests at the party panic and try to wake Vijay up but as they were trying to revive Vijay they found another dead body inside the tank. What is the mystery behind this double death?