Answer:
The purpose is to show Emilio in a more humane way, introducing a relative of his.
Step-by-step explanation:
Martin was Emilio's uncle and was very upset by the news of his death, because he had a great rapprochement and admiration for his nephew who was murdered so young and so brutally. When the article begins with the moment when Matin received the news about Emilio's death, the article wants to humanize Emilio, show him as a member of a family and someone loved and important to those close to him.