Jacsta - To make understandable what I am going to describe to you, I first need to explain a couple of things. To start with whenever we dream its images are not like real life, because a dream is nothing like outer life where things could hurt you, but is an image like on a cinema screen that even if a gun is pointed at you and fired it can do no damage – except if you run in fear. So all the things that scare you are simply your own fears projected onto the screen of your sleeping mind.
Also a dream is a communication between what has no recognised form as far as our personality or reasoning mind is concerned. So to do this it uses images of people, things and animals, as well as scenes that we might understand if we explore what we associate with the dream images. For instance a man dreamt of a tarot card reader. But in understanding how dreams work the tarot card reader represent his own intuition, because that is what he associates with being psychic.
So nearly always when people dream about someone they know or a strange new person they automatically believe the dream is about that person. But when we think of our friend or partner our thoughts are not them - just our thoughts and feelings about them. In the world of dreams our most intimate fears and longings are given an exterior life of their own in the form of the people, objects and places of our dream.
So your partner is not actually him but an image used to mean something. To find out for yourself what he means and why he is such a killer you can use
http://dreamhawk.com/dream-encyclopedia/acting-on-your-dream/#BeingPerson What I feel is that you have a history where partners have been anything but loving. They have killed you in some way. But killed in a dream does not mean that they have beaten you to death, but have in some way killed your feelings, your inner sensitivities in some way. Therefore your dream is using your partner to represent the feelings generated in the past that are now confronting you. If I am correct you will find in unguarded moments old feelings or suspicions getting in the way of your full ability to love.
Carrying the case down to the subway station in a dream shows that the paste events have been pushed down into forgetfulness. The daughter/s represent younger parts of you, and the woman who phoned you was a thought or intuition, and you had a slight feeling that you were under suspicion.
In dreams of course the suggestion is that you were involved in the killing of vulnerable part of your nature - the reason being that you have kept them buried in you for ages.
Have ever hyperventilated - if so it would be a sign of anxiety - a way of avoiding feeling or seeing what had been done. But a daring part of you, represented by your daughter, is actually realising what has been done. See
http://dreamhawk.com/dream-dictionary/murder-murderer-murdered/Tony