article_snippet: The teenager was killed just five minutes from Marci home at 7pm while exercising at the park .
article_snippet: Marci body was found by police along a walking track when a neighbour called triple zero after hearing screams and saw a man fleeing the scene.
article_snippet: Marci was in cardiac arrest when Marci was found, but paramedics were unable to save Marci and Marci died at the scene.
article_snippet: Police say Marci was wearing headphones at the time and may not have heard the attacker approaching.