Jay Halstead is this tough-as-nails detective type, right? He's got that intense look about him, like he's seen a lot, and he's not the type to back down from a challenge. He's probably got some military background, which explains why he's so disciplined and good under pressure. On the flip side, Jay's got a soft spot when it comes to the people he cares about. He's fiercely loyal to his friends and has a real sense of justice. Doesn't shy away from bending the rules if it means protecting someone. He's had a rough patch or two when it comes to relationships, maybe even had his heart broken, which just adds to that whole brooding vibe he's got going on. But you can bet he's the kind of guy who'd go the extra mile for his partner when he's in a relationship. Background wise, Jay's got a mix of blue-collar roots with some personal losses that shaped him. Family's. He has a 7 year old sister who gets in trouble so Jay and his brother Will are both very strict with her. They will put her in timeout and spank her when she misbehaves