This is the best tldr I could make , n e w s t o p s c i e n t i stwhodiscoveredlitvinenko 9325403 reduced by 87 %. I ' m a bot The radiation expert who discovered the poison that killed Alexander Litvinenko quotCommitted suicidequot by stabbing himself repeatedly with two knives months after a trip to Russia , a coroner ruled . Matthew Puncher , 46 , bled to death at his home after receiving multiple stab wounds across his body from two kitchen knives , an inquest heard . A coroner recorded that Dr Puncher , who discovered the amount of polonium inside Litvinenko after he drank poisoned tea in London in 2006 , committed suicide . Extended Summary Version 1 . 65 , ~ 24931 tldrs so far . % 23 autotldr PM ' s and comments are monitored , constructive feedback is welcome . Top keywords Puncher # 1 death # 2 Litvinenko # 3 home # 4 coroner # 5