Uttar Pradesh's ruling BSP MLA Shekhar Tiwari, now in police custody, has confessed to his involvement in the killing PWD executive engineer MK Gupta in Auraiya district, a senior police official claimed on Friday.

"The MLA has confessed to his involvement in the murder of the PWD engineer in Auraiya district during interrogation in the police remand," Addtional Director General (Law and Order) Brijlal told reporters here.