One of the more unique aspects of Prey is that every dead NPC you find littered around the Talos I space station has a name. It's not just "Doctor" or "Engineer" anymore.
One side quest tasks you with finding every Talos I employee who went missing as soon as things went wrong at the station. Grant Lockwood is one such employee, whose location is listed as "Talos I Exterior."
How to find Grant Lockwood in Prey
At a certain point in the story, you get the ability to freely fly around outside the Talos I space station. There's a ton to find out here in the dark reaches of space, including a corpse or two. Human corpses will show up on your HUD when you get close enough, but Grant Lockwood is a little out of the way. According to GameFAQs user jonsarik, you can find him near the derelict shuttle:
I found him new the derelict shuttle a bit from Talos. After reaching the derelict shuttle, I exited heading towards the rear. You'll see a golden mimic in the far distance (Weaver). Head towards it. After battling it, I noticed a human corpse about 150 meters away. Heading towards it, it turned out to be Grant Lockwood, and he was emitting radiation. That's where he was for me, and I didn't have to go to a security station, but it was after I activated his tracker. Good luck!
It sounds like you shouldn't do this without a healthy supply of ammo and medkits. There are other activities associated with the derelict shuttle, so you should eventually find yourself in that area as a result of the story. But steer clear until you know you can keep yourself alive.
More Prey news, updates, tips and tricks
For more on Prey, check out the rest of what Mic has to offer. Here's a guide to find all the safe locations and keycodes, and here's one showing where to find the pre-order bonus. Here how long it takes to beat Prey, and some of the secrets you can find in the demo. Finally, here’s our guide hub where you can find all our Prey content.