Joshua Michals has told how he stabbed Zhe Wang after she came at with him with a knife looking 'demented' and 'possessed' as she believed she had contracted a sexually transmitted infection Joshua Michals is standing trial at the Old Bailey (Image: Getty Images)

A student has told how he fatally stabbed his "possessed" girlfriend after she attacked him with a knife because she wrongly believed he'd given her an STI . American Joshua Michals, 26, stabbed 31-year-old Chinese national Zhe Wang to death at her flat in London.

Michals called police on March 20 last year to say there had been a 'knife incident' at her flat in Manor Park, Hither Green in the capital . When cops arrived, they discovered Ms Wang in a pool of her blood.

They had met at Goldsmiths, University of Lon

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