Why does the intruder choose Gerrard as the man whose identity he wants to take on?

The intruder was a murderer who was constantly being chased down by the police. To escape from the situation, he chose Gerrard as the man whose identity he could easily impersonate. In addition, he found Gerrard to be quite similar to him and thought that if he would kill him and then behave and look similar to him, there would be hardly any chances of him being caught.