According to the postmortem report, he was cut from the forehead to nose and the wound was approximately 21cm in length and 6cm in depth, thus he died instantly.
ちなみに事件後の検死結果によると、額から鼻にかけて断ち割られ、傷は長さ約21㎝、深さ6cmに達し、ほぼ即死の状態であったとされる。