The storyline had been kept top secret by the BBC, meaning it had a huge impact among long-time fans of the series when it eventually aired – and recently secured a nomination for Best Single Episode at the British Soap Awards.
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Speaking to RadioTimes.com on the red carpet, Walker discussed performing the hard-hitting episode and his hopes for the widowed Rob Hollins.
"It was very intense," he began, recalling the tough shoot. "Wonderful to do, but a stretch – and, you know what, as an actor, you like to be stretched. Looking back at it now, it was great. At the time, a lot of pressure."
Walker went on to say that he genuinely doesn't know what's coming up next for Rob, explaining that he prefers "to be surprised" than to know too much in advance.
On what he would want for the character, Walker joked: "I'd like Rob to win a million quid on the lottery and film in Barbados for a couple of weeks."
On a more serious note, he added: "Rob's happy at work. That's what makes him happy because he's good at what he does."
Doctors airs Mondays to Thursdays on BBC One at 1:45pm. Check out more of our Soaps coverage or visit our TV Guide and Streaming Guide to find out what's on.
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