A senior investigative journalist working with MiD DAY was today shot dead in broad daylight by unidentified persons in Mumbai. The victim, Jyotirmoy Dey, was rushed to the Hiranandani hospital where he was declared brought dead. The incident occurred in the suburban Powai area of the city. According to police, four motorcycle-borne men fired at Mr Dey this afternoon. The shooters escaped from the spot, police added.