A doctor, a lawyer and an engineer were all walking on a deserted street and they were arguing on some topic and suddenly a quarrel sparked between the arguments and the engineer killed the lawyer. Just before the lawyer died he shouted "He killed me" and soon after he collapsed. Policemen were just passing on adjacent street and heard the sound and arrived at the spot. The engineer told the police that the doctor is the murderer and the doctor said that the engineer is the murderer and they were quarreling. There is no evidence to suggest engineer only had killed the lawyer and also no eyewitness for the murder committed except the doctor. The police quickly intervened their quarrel and arrested the engineer. How did they come to know that he is the murderer?
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Answer: The doctor was a female and the engineer was a male. When the lawyer shouted "He killed me" it obviously refers to the engineer.
