A citizen's call alerted the Mumbai police about a woman's naked body at an under-construction building at Premier Road in Kurla (West) on Wednesday morning. The VB Nagar police team reached the spot and found a "woman in a late 30s", who appeared to be a labourer. Cops suspect she was sexually assaulted before her murder, but are waiting for the autopsy report for confirmation. Meanwhile, a case of murder has been registered against unknown people.