A 71-year-old retired Air Force employee died when he accidentally fell from fourth floor of a building while chasing a monkey which was fleeing with his tiffin on Friday. The incident was reported from a building in Patparganj industrial area in East Delhi. The victim,Devidutt Narayan,a retired IAF employee,worked as a security guard in an office. He tried to re-claim his tiffin and chased the monkey but accidentally fell down from the building. He died on the spot, a senior police official said.