An accused in the murder of Umesh Pal, the prime witness in the 2005 killing of Bahujan Samaj Party MLA Raju Pal, was shot dead by the Uttar Pradesh police in an encounter in Prayagraj’s Nehru Park on Monday. The police said the deceased, Arbaaz, drove the vehicle used by the assailants who murdered Umesh outside his house in Dhoomanganj …