PUNE, March 6 -- The Maharashtra Criminal Investigation Department (CID) on Thursday questioned VK Singh - owner of Delhi-based VSR Ventures that owned the Learjet 45 which crashed on January 28, killing deputy chief minister Ajit Pawar. "VK Singh's questioning is expected to be a crucial step in the probe as investigators attempt to piece together the chain of events that led to one of Maharashtra's most high-profile aviation tragedies in recent years," a CID officer aware of the developments said. He added that Singh arrived at CID headquarters around noon and stayed till late evening. "Singh's statement is being recorded," the officer said, declining to disclose further details. P3...