Filliz,
Sometimes when we lose something close to us, we get a helpless feeling and in order to deal with it, we convert helpless sorrow into focused rage.
Unless you know someone who point blank wanted to poison your cat, them I am sure that it died of natural cat causes.
Cats often poison themselves as they tend to eat or nibble on a variety of strange things. My cat would eat grass and dandelions and throw them up in the living room.
As for having it's eyes open, that is the natural state of death. Remember people used to place coins over the eyes of dead people to close them.
As for the stiffness, this is a result of "rigor mortise" and it happens just a few hours after death. Basically the muscles lose their ability to contract or relax and so the animal is stiff as a board.
Sorry to hear about you loss, pets are something with which we form a rather strong bond. Some people don't "get" pets and will not understand your feelings, but fuck them anyway.
The state you found you cat in no way makes me think it was poisoned, it was just an unexpected loss of young healthy pet. Don't make matters worse by striking out at others or carrying anger in your heart.
Accept the loss, keep your positive memories and move on (easier said than done, I know).
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