Duncan never accepts things at face value. You could even say he's cynical. He often doubts suspects' stories and keeps pressing away until he gets the truth. He doesn't always follow procedure, but he almost always gets the right result. Duncan's especially good at turning the tables on suspects and calling them on their lies.
A very private person, Duncan has a tough, even brash, exterior and even his closest friends - his fellow detectives - know very little about his personal life. He's a very loyal and protective colleague and will always have his co-workers' backs.
Following the death of his fiancee Claire in Series One, Series Two sees Duncan concentrate on his career. He cracks difficult cases with relish and faces new challenges and opportunities. He even has the chance to meet someone new, not that he'd ever let on to Matt, Jennifer or Simon.
Classic Duncan Quotes:
"We're Homicide! We catch killers. That's our job!"
"You bisexual as well as ambidextrous, are you?"
"Look at this! You wrecked a good jacket here, so spare us the crap!"
"So he took off his clothes and got into bed so you could counsel him?"
"Our Matty. He's going places. Won't be long before we're all calling him Sarge."
"What's Maori for ‘you're under arrest'?"

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Sorry, hailey.fairez, I don't want such a clash. Saw it in Wildside, and The Circuit. Just let Duncan be Duncan, not Aaron or some symbol.