Pune, June 27 -- Police probing the suspected murder of Pune-based realtor Ketan Agarwal at Lohagad Fort on Friday said accused Siya Goyal's brother, Sahil Goyal, had known about her relationship with co-accused Chetan Chaudhary and had advised her to end it as she was engaged to Ketan. Ketan died on June 18 after falling from Lohagad Fort. Police are investigating the case as a suspected murder. His fiancee, Siya, and her friend Chetan have been arrested and are in police custody. Investigators questioned Sahil for over two hours about when he learnt of the relationship and whether other family members were aware of it. "Sahil told us he had learnt about Siya and Chetan's relationship several months ago. Concerned about its implications, h...