Kho Jabing, 31, was expected by his family and rights groups to be executed at dawn tomorrow but was granted a stay of execution following a last minute application by his lawyer today evening, exploiting a legal loophole.
Kho was sentenced to death in 2010 for killing a Chinese construction worker in a robbery gone wrong two years earlier and spent the next six years on a legal roller-coaster trying to avoid the gallows.
A five-member appeal court dismissed an 11-hour application today to set aside the death sentence but defence lawyer Jeannette Chong-Aruldoss filed a separate suit against the attorney-general asking to halt the execution.
While permission was denied after a two-hour hearing that stretched late into the night, under Singapore law all court decisions can be appealed.
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That appeal will be heard tomorrow morning at the Court of Appeal, and in the meantime Kho's execution will be suspended until the case is concluded, the Supreme Court said in a statement.
There was no immediate statement from Malaysia, which also has capital punishment, executing murderers and drug traffickers by hanging, a system like in Singapore that dates back to British colonial rule.
Amnesty International Malaysia and Human Rights Watch have both released statements calling on Singapore to halt the execution and review the case.
After Kho was sentenced to death in 2010, Singapore amended its mandatory death penalty for murder, giving judges the discretion to impose life imprisonment under certain circumstances.
His case was reviewed and Kho was re-sentenced to a life term in 2013.
Another appeal, which stayed his execution scheduled for November 2015, was thrown out last month.