To unlock the "DEVIANT LOCATED" trophy in Detroit: Become Human, you need to reach Connor's second chapter, "PARTNERS".
First, locate your new partner. Inside the bar you need to position yourself so that you can scan the drunk-looking guy with the shaggy gray hair sitting at the bar. Allow the conversation to play out. Keep it friendly and buy him another drink if you're going for:
At the crime scene, follow Hank inside and then start gathering evidence. You want to investigate the knife on the floor in the first room, the chair in the kitchen and the bat in the kitchen, and then investigate the victim's body. From this you should be able to reconstruct the series of events; starting in the kitchen, the victim lashed out at the android with a bat, the android retaliated with a knife and the fight went into the living room. The android finished the job with the knife. After the conversation, follow the blue blood traces on the floor back towards the kitchen and left towards the bathroom. You should be able to spot where a ladder was placed against the wall and look up at an attic entrance. Return to the kitchen and grab a chair. Place it under the attic door. Climb up and walk through the attic. A scene will play out to end the chapter, and you'll earn this trophy when you get to the flowchart.
It's possible to end this scene without finding the culprit, meaning you miss the trophy. So make sure to keep a good rapport with Hank and be reasonably quick about exploring the scene. If you dawdle, Hank will try and leave; if he doesn't like you at all, he'll insist, leading to the "Crime Unsolved" ending.
It's worth noting that Connor can't die in this chapter so nothing you do will impact the following trophy: