He arrived back at the shop to find it collapsed and started trying to get to his wife.
"Everyone was too scared to go in," he said.
"But I went in and started working my way through. Next thing, I had all my neighbours helping."
Mr Hadfield and Wick's Fish employee Jason Gibb managed to find Natasha and a female customer in the rubble but there was no sign of life from either.
Former owner of Wick's Fish, Wayne Wicksteed, said Natasha was like a daughter to him.
"She was wonderful. She had a great work ethic.
"Everything about her was spot on - she was hard-working, honest, reliable."
Natasha and her husband have a young son, who Mr Hadfield said was doing well in the circumstances.
He described Natasha as a "fantastic, loving mum, who absolutely doted over her little boy".
"She was a beautiful, well-respected woman that's going to be sadly missed inside and outside the industry she worked in," he said.