A&nbsp;Singapore&nbsp;court&nbsp;rejected on Tuesday an&nbsp;appeal&nbsp;against the&nbsp;execution&nbsp;of a Malaysian convicted of drugs smuggling, dismissing an argument put forward by his legal team that he should be spared because he was mentally impaired.

Nagaenthran Dharmalingam has been on death row for more than a decade for trafficking about 42.7 grammes (1.5 oz) of heroin into&nbsp;Singapore, which has some of the world's toughest narcotics laws.

His plight has attracted international attention with a group of United Nations experts and British billionaire Richard Branson joining Malaysia's prime minister and human rights activists to urge&nbsp;Singapore&nbsp;to commute his death sentence.

Also read |&nbsp;<a href="https://www.wionews.com/world/singapore-suspends-doctor-for-injecting-patients-with-saline-solutions-in-place-of-covid-vaccine-466527">Singapore suspends doctor for injecting patients with saline solutions in place of Covid vaccine</a>

Dharmalingam's lawyer Violet Netto had objected to presenting her client's prison medical records at the last hearing, citing confidentiality, and instead requested an independent psychiatric review.

But at Tuesday's hearing Chief Justice Sundaresh Menon said the bid to prevent the disclosure of medical reports was unreasonable and there was no admissible evidence showing any decline in his mental condition.

The&nbsp;court&nbsp;also dismissed the request for an independent psychiatric review.

"The appellant has been afforded due process under law, and it is not open to him to challenge the outcome of that process when he has put nothing forward to suggest that he does have a&nbsp;case&nbsp;to be considered," the five-judge panel said in its ruling.

Dharmalingam, who was wearing a purple prison uniform, did not appear to show any reaction to the ruling.

Also read |&nbsp;<a href="https://www.wionews.com/world/singapore-to-further-relax-covid-19-restrictions-as-cases-decline-says-pm-465178">Singapore to further relax COVID-19 restrictions as cases decline, says PM</a>

M Ravi, Dharmalingam's former lawyer who has continued to assist in the&nbsp;case, told reporters that the Malaysian had exhausted legal options to escape the death penalty.

Anti-death penalty group Reprieve said it believed Nagaenthran  is intellectually disabled and should be protected from the death penalty.

In a statement, Reprieve director Maya Foa called on&nbsp;Singapore&nbsp;President Halimah Yacob "to listen to the cries for mercy within&nbsp;Singapore&nbsp;and around the world."

It was not immediately clear when the&nbsp;execution&nbsp;would be carried out.

From 2016 to 2019,&nbsp;Singapore&nbsp;hanged 25 people - the majority for drug-related offences, according to official data.

Watch |&nbsp;India slams Singapore PM Loong after he targets Indian lawmakers

<div class="videoWrapper trancodeVideo"><iframe allowfullscreen="" autoplay="1" class="includeVideo" frameborder="0" height="350" src="https://www.wionews.com/videos/india-slams-singapore-pm-loong-after-he-targets-indian-lawmakers-454186/embed" style="width:100%;max-width:560px;" width="560"></iframe></div>

A Singapore court rejected on Tuesday an appeal against the execution of a Malaysian convicted of drugs smuggling, dismissing an argument put forward by his legal team that he should be spared because he was mentally impaired.

A Singapore court rejected on Tuesday an appeal against the execution of a Malaysian convicted of drugs smuggling, dismissing an argument put forward by his legal team that he should be spared because he was mentally impaired. Nagaenthran Dharmalingam has been on death row for more than a decade for trafficking about 42.7 grammes (1.5 oz) of heroin into Singapore, which has some of the world's toughest narcotics laws. His plight has attracted international attention with a group of United Nations experts and British billionaire Richard Branson joining Malaysia's prime minister and human rights activists to urge Singapore to commute his death sentence. Also read | Singapore suspends doctor for injecting patients with saline solutions in place of Covid vaccine Dharmalingam's lawyer Violet Netto had objected to presenting her client's prison medical records at the last hearing, citing confidentiality, and instead requested an independent psychiatric review. But at Tuesday's hearing Chief Justice Sundaresh Menon said the bid to prevent the disclosure of medical reports was unreasonable and there was no admissible evidence showing any decline in his mental condition. The court also dismissed the request for an independent psychiatric review. "The appellant has been afforded due process under law, and it is not open to him to challenge the outcome of that process when he has put nothing forward to suggest that he does have a case to be considered," the five-judge panel said in its ruling. Dharmalingam, who was wearing a purple prison uniform, did not appear to show any reaction to the ruling. Also read | Singapore to further relax COVID-19 restrictions as cases decline, says PM M Ravi, Dharmalingam's former lawyer who has continued to assist in the case, told reporters that the Malaysian had exhausted legal options to escape the death penalty. Anti-death penalty group Reprieve said it believed Nagaenthran  is intellectually disabled and should be protected from the death penalty. In a statement, Reprieve director Maya Foa called on Singapore President Halimah Yacob "to listen to the cries for mercy within Singapore and around the world." It was not immediately clear when the execution would be carried out. From 2016 to 2019, Singapore hanged 25 people - the majority for drug-related offences, according to official data. Watch | India slams Singapore PM Loong after he targets Indian lawmakers

Singapore court rejects Malaysian's appeal in high-profile execution case

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Singapore court rejects Malaysian's appeal in high-profile execution case