Goa, June 24 -- Pune trekker Ketan Agarwal, 26, who fell to his death at Lohagad Fort on June 18, is now at the centre of a murder probe after police arrested his fiancee, 20-year-old Siya Goyal, and her alleged lover Chetan Chaudhary.

Initially treated as an accidental slip while taking photographs, the case shifted after investigators, family members and technical evidence raised doubts.

Ketan's family alleged Siya had earlier pushed him near the same edge on June 14; a tree broke his fall then. Despite his reluctance to return, they say Siya persuaded him to come back on June 18 saying she wanted to celebrate her birthday.

Police allege Siya and Chetan conspired and pushed Ketan into a gorge, and both have confessed, according to au...