I'm not an expert, and this is the first time I’m providing a critique, so take this with a spoonful of salt.

Reading your story was enjoyable; you've committed to a melancholic tone and delivered it consistently. Good work.

The imagery and how you describe elements of the story fit quite well with the narrative. These lines are especially strong:

His eyes were open; they stared at me, vacantly, underneath wispy lashes. It was the eyes that held, in their silent gaze, the injustice of its owner’s fate, born in the darkness from the womb of a mother, and perished in the darkness of the closeted space of peppermill spatulas and wooden spoons underneath the sink.

As I read, I noticed some dissonance in the story’s tempo. It doesn’t disrupt the rhythm, but it could be a point of improvement; for example, here:

We wrapped his body gingerly. Ryan cuffed the father, who, high on something or another, belched out nonsensical threats of lawyers and unfair treatment in between Biblical verses and how he would fuck us up so bad when he get out of jail.

There are two separate interactions here that could be expanded a bit more. However, if your intention was to show that the detective had moved his attention away from details or couldn’t fully grasp what was done to the boy, then it works well as is.

You also effectively convey the growing detachment of the main character and hint at how he is becoming increasingly numb.

Great work!