I'm guessing e-fit is some kind of Britishism for identikit (a drawing of a suspect based on witness descriptions), so the headline means they're releasing some identifying material on a suspect they're trying to find. (Widow could be victim, or perp).
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(I was thinking an e-fit is what people have all the time when they're arguing on the likes of LiveJournal. ^^;;;;)
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Not Peeking Yet