Dear Sandeep, if u might have seen on TV, the same apartment was shown , and Arushi's door was just 2-3 ft away from Talwars room, even Hemraj's room was not that far away. But that does not answer one question - why did Hemraj ever fear for his life , and why did he approach that social worker, a few days back itself ? There must be a more convincing reason for a murder, which Hemraj knew, and was afraid of. Surely that reason would not have been Krishna being scolded by Talwar..