However, the clue which led directly to Rîmaru's arrest was a medical diagnosis sheet. On 4 March 1971, a group of six doctors found that he had "suspected periodic epilepsy"; the doctors' note was found beneath the body of Mihaela Ursu, whom he murdered in especially brutal fashion two months later. Between her fingers she had strands of his hair that were used to identify him (some have suggested that he went to the doctors to eventually be able to claim insanity at trial). Because the note was wet and bloody, only the letterhead from the Bucharest Students' Hospital was visible.