What is a weapon

The morning, Li Xing is at home to do lunch, when he was removed from the refrigerator and food preparation when cooking, Hu Wen fighting next door came the sound of him quickly out of view, is next door to the couple again in a fight, he persuaded his return after a few家.
Within a short while next door they heard sound of fierce tussle, Li Xing had left out, I heard "bang" in a dull sound of mind, followed by the voice of the human body lying on the ground, he quickly rushed next door to the kitchen, the can see the hostess hands empty hanging, staring in horror has been lying on the ground, the men who breathed.
As Interpol, Li Xing was in charge of this people's business. He was not away from the scene, called his wife to call a report. A moment, Interpol forensic team came to the scene, the test results are back of the head man of the house was hit by a hard object, stick type, resulting in the death skull base fracture. May be surprising is that on-site forensic club class could not find a hard object, the kitchen stove where there is only cutting boards and knives, a large herring. Interrogation mistress, mistress of the house silent. Li Xing, and the scene of the Interpol were all wondering, and women do not leave the scene, it is impossible to hide lethal weapons, then what is it lethal?
Li Xing away Interpol team colleagues, to return to their homes after suddenly remembered something and quickly ran downstairs and told my colleagues, weapon is.
I ask, do you know what that is?