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Winehouse's lover described "graphic scenes" that made Mitch the victim in a horror movie, reports The Sun.
"I could hear Mitch physically shaking when he phoned to tell me about the letter," said a friend of the taxi driver.
"He couldn't even bring himself to read it out loud as it was just too sickening.
"Part of Mitch wants to pursue this further with the police, maybe even taking out a restraining order. But then he is worried about it all driving a wedge between him and Amy."
Fielder-Civil is currently serving a 27-month sentence at Highpoint Prison, Suffolk.
