But the popularity of “Coronation Street” doesn't travel far outside Britain. Hett, who lived in the Manchester area, was known around the world because of his public affection for another woman: his mom.

Their bond played out through years of online conversations, which Hett would always find a way to make public.

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Typical example, a dire post on his mom, Figen Murray's Facebook wall in 2015:

“Our cat is missing since three nights! Am utterly miserable!”

“I've made you a poster mum, check your emails.”

“Thanks Martyn, you redeemed yourself after assaulting my phone. "

We don't know what happened to the cat. But later that year, the mother-son relationship went national.

Hett was housesitting for Murray in 2015, and found she'd left him “a vast array of notes” — as he described them when he photographed each one and put them online.

There were more than a dozen instructions, addressing everything from the Netflix code to matters of the heart:

“Don't do a No. 2 as it does not flush well.”

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“Stay in touch: email, What's Up, FaceTime.”

“She does it every time she goes away,” Hett told the Daily Mail in 2015. “I have absolutely no idea why she leaves so many, but I find them quite endearing.”

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While Hett built up an online fan base — fueled by his soap-opera blogging, '90s-era fashion and a reality-TV appearance with his boyfriend — his mother struggled to break into a more old-fashioned business.

Murray's lonely table of hand-knit plushies turned out to be a breakout moment for both her and her son.

Hett's friends started ordering them soon after he tweeted his plea.

Before long, strangers were getting in on the act — quickly buying up the entire supply, rewarded by screenshots of a mom's joyful texts.

The story traveled from the Manchester Evening News to BuzzFeed, and Murray's online store is still sold out.

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Now Hett's mom had a viral following of her own. Naturally, when she bought a book called “Everyday Twitter Made Easy,” Hett posted the photo.

Murray wrote a book this year — about teddy bears overcoming difficulties. She told the BBC that knitting the bears helped her get through depression.

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“I honestly couldn't be prouder!” Hett wrote last month.

This month, he booked off from his day job at a public-relations company and prepared for a vacation in the United States.

But before he left, he had another woman to see: Ariana Grande at the Manchester Arena.