How did I miss this detail in Silent Hill 2. Police intervention in Silent Hill?

I was playing sh2, and further in the game when I wanted to backtrack where I did kill the first monster, there's a police ducktape blocking the way.

I most have killed a real person? Or did I kill Mary actually,

According to wiki : ***The creature's upper torso is a body bag, the sign of a corpse, from which it writhes from side-to-side. Its movements represent a hospital patient squirming in agony[6][7][8][9] and the creatures were born from James' feelings of confinement.[10][6]

The name "Lying Figure" refers to both Mary's corpse and Mary in her sickbed*** .

The early concept of Lying figure shows a person in a body bag, wich in my opinion may refer to Mary's covered body in James's car.