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The famous detective Percule Hoirot was called in to solve a naffling ,murder mystery. He determined the following facts:

1. Lord Hazelton, the murder man, was killed by a blow on the head with a brass candlestick
2. Either lady Hazelton or a maid, Sara was in the dining room at the time of murder.
3. If the cook was in the ktchen at the time of the murder, then the butler killed Lord Hazelton with a fatal dose of strychnine
4. If Lady Hazelton was in the dining room at the time of the murder, then the chauffer killed Lord Hazelton.
5. If the cook was not in the kitchen at the time of murder. then Sara was not in the dining room when the murder was committed.
6. If Sara was in the dining toom at the time the murder was committed, then the wine steward killed Lord Hazelton.

Is it possible for the detective to deduce the identity of the murderer from the above facts If so, who did murder Lord Hazelton ?? (Assume there was only one cause of death)