Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: A cross-dressing Psycho-style killer who killed his mother in a frenzied attack has been jailed for life. Emmanuel Kalejaiye, 22, stabbed his mother, Tolu Kalejaiya, more than 40 times at their home in Wickford, Essex, in September 2013. He then dressed up in a women's tracksuit to try and fool neighours into thinking she was still alive, the court heard. In a case with strong echoes of the 1960 Alfred Hitchcock film - in which killer Norman Bates impersonated his dead mother - the prosecution alleged Kalejaiye had planned to commit the 'perfect murder' by killing the 44-year-old before dressing up as her to allow himself precious time to dispose of her body.Emmanuel Kalejaiye stabbed his mother Tolu Kalejaiya more than 40 timesHe dressed up in women's clothing to make neighbours think she was aliveCase echoed 1960 Hitchcock film in which killer impersonated dead motherThe 22-year-old was found guilty of manslaughter last year and jailed today 
 Question:Evidence from an expert psychiatrist stated _ had been suffering from severe depression and paranoid schizophrenia at the time of the attack.

Emmanuel Kalejaiye