Australia's police on Thursday stepped up efforts to identify the killer of 21-year old Indian-youth Nitin Garg who was brutally murdered recently. <br/> <br/>Inspector Bernie Edwards, Australia's leading homicide squad detective appealed to public for information on the murder.<br/> <br/>Edwards has asked the killer of Garg to surrender guaranteeing him safety.Nitin Garg was murdered in a Melbourne park last Saturday night as the 21-year old Indian was going to work at the nearby Yarraville Hungry Jack’s restaurant.<br/>