Dream about sister being killed is a hint for your fleeting desires of being wild, free and spontaneous. You are at a phase in your life where you are not quite a child and not quite an adult. You are being overindulgent. Your dream points at a transitional period or phase in your life. You feel that others are judging you and your actions.
Sister being killed dream hints the various aspects of your conscious being and how you connect to the universe. You need to shake things up a bit. You need to show more of your nurturing and caring nature. This is a symbol for broken promises. Perhaps you are sad about something that happened with a person.
If you dreamt about sister being killed:
You will be invited to social engagements and once you get there, you will be the star of the show. At first you may be hesitant to mix business with pleasure but it will behoove you to do so. An important breakthrough will be made when you do.