Hunt on for 'horrendous' Melbourne killer

By Melissa Iaria and Andrew Drummond
Updated January 17 2019 - 6:46pm, first published 6:44pm
A baseball cap and t-shirt found at the scene are believed to belong to the killer.
A baseball cap and t-shirt found at the scene are believed to belong to the killer.

An exchange student killed after alighting a Melbourne tram was ambushed as she chatted with her sister by phone, police have revealed, with known sex offenders under suspicion over the "horrific attack".