President Joko Widodo said he will intervene if she was sentenced to death

Ms Salihin's father said Wongso 'has to be killed to set an example'

She allegedly put cyanide in the victim's iced coffee at Olivier Grand Cafe

The woman accused of killing her friend by slipping cyanide in her iced coffee 'has to be killed as an example' her friend's father says, as Indonesian President Joko Widodo said he will intervene if she is found guilty and sentenced to death.

Australian resident Jessica Wongso is due to face trial in Jakarta over the death of Mirna Salihin, 27, in a local café in January after drinking a coffee police said was laced with cyanide.

Dermawan Salihin, 64, said Wongso should face the death penalty if she is found guilty because if she, 'manages to get away then the same thing can happen to other people'.

Australian resident Jessica Wongso (at left) is accused of murdering her friend Mirna Salihin (right) by allegedly slipping cyanide into her iced coffee at a cafe in Jakarta in January

'This girl has to be killed as an example so nobody else follows what she has done. Everybody in Indonesia is watching this,' Mr Salihin told The Australian.

However President Widodo has said he will intervene if Wongso is sentenced to death, honouring an agreement the country made with Australia.

Indonesia's Justice Minister Yasonna Laoly revealed the Australian resident was not at risk of being put to death, while adding the trial may have not been possible without the support of the Australian Federal Police, the ABC reports.

'As a state we have to respect the international agreement,' Mr Laoly said.

Wongso (pictured earlier this year in her orange jumpsuit) could face the death penalty despite a promise Australian Justice Minister Michael Keenan was given

It was previously alleged Ms Wongso was jealous (Ms Salihin pictured on wedding day with friends)

It comes after Australian Justice Minister Michael Keenan previously said he had been promised Wongso would not be sentenced to death and had approved Australian Federal Police assistance in honour of that agreement.

But a Central Jakarta District Court has now said there is no binding agreement preventing the death sentence because the Indonesian justice system 'does not recognise that kind of deal'.

'No such deal is possible in our system,' District Court Judge and court spokesman Jamaluddin Samosir told ABC earlier this month.

'The judges can decide any penalty they want. We are independent, there can be no intervention.'

Murder is a capital crime in Indonesia.

Criminology Professor Adrianus Meliala from the University of Indonesia in Jakarta told ABC the death sentence was unlikely but couldn't be ruled out.

Mirna Salihin (pictured), 27, died in January after police believe her iced coffee was spiked with cyanide a few weeks after she was married

Ms Salihin (seen above during another outing) began foaming at the mouth and convulsing after drinking the coffee

A spokesperson for Mr Keenan's office told ABC: 'The Indonesian government has given an assurance to the Australian government in writing that the death penalty will not be sought nor carried out in relation to the alleged offending.'

Ms Salihin began foaming at the mouth after one sip of Olivier Grant Cafe's 'Vietnamese coffee' and died on her way to hospital on January 6.

Wongso ordered the drink for Ms Salihin after arriving at the restaurant an hour before her in January.

She was seen handling the beverage on CCTV footage before her friends arrived, according to local media.

MsSalihin had only just married her partner Arief Soemarko, who was left devastated after her death (pictured together)

Ms Wongso (above being escorted by police) is accused of murdering her friend by slipping cyanide into her iced coffee in January

The 27-year-old was arrested on January 30, some three weeks after meeting her friend at the cafe. She denies one count of pre-meditated murder.

Wongso, a permanent resident in Australia, studied with Ms Salihin at the Billy Blue College of Design in Sydney and at Swinburne University of Technology.

They graduated in 2008 but Wongso remained in Sydney to work. She returned to Indonesia sometime afterwards but the pair had grown distant, it was claimed by local police.

The 27-year-old woman (pictured escorted by police) denies killing her friend and has vowed to clear her name by helping police