Cleared: Nargis Riaz (pictured), 22, wept as she was acquitted of murdering her boyfriend

An Imam's daughter broke into tears in court today as she was acquitted of murdering her boyfriend who threatened to post 'revenge porn' to her Muslim family.

Nargis Riaz, 22, allegedly asked her 'bad boy' lover Gulam Chowdhury, 24, to 'eliminate' ex-boyfriend Mohammed Yasser Afzal - who said he would show topless pictures of her.

The law student broke up with 22-year-old cab controller Afzal in 2012 but he continued to pester her and threatened to expose their 'secret love life', the Old Bailey heard.

Riaz, who worked for Primark, went to see Mr Afzal at his family business - the E20 minicab offices in Stratford Broadway, east London - on the night he was killed.

When she was alone with him, Chowdhury stormed in, vaulted the reception counter and repeatedly stabbed Afzal in a 'frenzied and savage attack'.

Dramatic CCTV footage captured the shocking moment Afzal was stabbed 20 times before he bled to death.

Chowdhury was convicted of murdering Afzal after the first trial in April and sentenced to life with a minimum prison term of 28 years, which he is serving in Broadmoor secure hospital.

But Riaz, a second year law student at City University in London, wept while the images of the brutal stabbing were played in court and insisted she never wanted Mr Afzal to come to any harm.

Today, she sobbed into her hands as a jury of seven men and five women cleared her of murder after a retrial.

Giving evidence, Riaz told jurors she had sent 'topless' photos to Afzal and allowed herself to be pictured in bed with him during their sexual relationship.

She rekindled her relationship with teenage sweetheart Chowdhury when he came out of prison in February last year.

The devout Muslim texted her to say he was 'willing to burn in hell for you', adding: 'I am going to sort this... no one will hurt Nargis and live... A killing would be justified according to Islam.'

Riaz later replied: 'How would I live with myself knowing I got you to do the ultimate?'

The pair also discussed the film 'Bully' which involved a group of friends murdering an abusive ex-boyfriend, the court heard.

Chowdhury told her the attack was justified in Islam, saying: 'Cut the neck of the man who eyed up his wife.'

And he later reassured her: 'Don't worry little angel, it's me who's a psycho not you.'

Killing: Nargis Riaz was acquitted of murdering her ex-boyfriend, whose brutal killing was captured on CCTV (pictured)

On 24 March last year, Chowdhury murdered Mr Afzal in a frenzied attack at his taxi office after Riaz had arranged a meeting.

Prosecutors claimed Riaz hatched the plan to murder Mr Afzal to retrieve the compromising photos on his mobile phone.

But shown the shocking footage in court, Riaz wept as she said: 'All of a sudden the main door swings open, this guy [who was covered up] comes rushing in.'

She told jurors she had no idea it was Chowdhury at the time. When asked why she ran out instead of staying with Mr Afzal, she sobbed: 'When I saw that knife I was scared... I have never been that close to someone covered like that, waving a knife about.

'I clearly wasn't thinking because I went into shock... My mind went numb and when I went into shock my brain wasn't working. I couldn't take anything in.'

Riaz said she thought the blade had missed Mr Afzal, but began to think: 'Is that Gulam? I thought is that his way of getting the phone?'

Killer: Riaz allegedly told her 'bad boy' lover Chowdhury (left) to 'eliminate' Mohammed Afzal (right) but she insisted she wanted no harm to come to him

Riaz told jurors that at the time of his murder she still 'felt love' for Mr Afzal and never wanted him to be hurt.

She added: 'We took pictures together of us together in bed and some of the pictures were of myself sent to him.

'Some were topless pictures and the rest were pictures that we actually took of ourselves together.'

Riaz said she and Mr Afzal initially had a loving relationship but he became more 'controlling' and they began to argue.

'It got to a point where he would blackmail me saying if "you don't come to see me you know what I have got - I have got pictures. I can post them online, I can post them to your parents".'

Jurors heard text messages from Mr Afzal to Riaz in which he called her a 'f***ing ugly dog' and threatened to tell her mother her 'slutty daughter has got a boyfriend'.

Riaz admitted she was upset but when her own barrister Sarah Forshaw QC asked if she wanted to kill him, she replied: 'No, I didn't want to kill him.'

Chowdhury is serving his life sentence at Broadmoor secure hospital and was initially deemed unfit to plead due to mental health problems.