Crimes are usually carried out in silence but, it seems, Mr Ken Ong wanted the whole world to know what had driven him to wield the knife.
At 8.09am yesterday, he posted a "Final Note" on Facebook, speaking of his failed marriage and ongoing divorce proceedings.
Two minutes later, he e-mailed the same note to government and media offices with the subject line "Jurong Murder".
Even as Mr Ong was doing this, his wife lay badly wounded and dying, while police officers were already rushing to his Yuan Ching Road condominium.
Right after the e-mail, Mr Ong apparently turned the knife on himself.
"So time is up," read a portion of the e-mail he sent. "I will give you and the maid what you all deserve before I end mine."
Just minutes before, neighbours had seen his Filipino maid, Ms Jasmen Corpuz, 37, running down the stairs from their third- floor apartment screaming for help. She bore slash wounds on her shoulders and back, and on her left upper arm was a deep gash that exposed bone.
Blood streaming from her wounds, she screamed: "Sir stab mum! Sir stab mum!"
Mr Ong, 37, had allegedly stabbed his wife, Madam Karen Koh, 39, in their home before turning on Ms Corpuz. After Ms Corpuz fled, he locked the door to their third-floor unit at Parkview Mansions.
Police officers who broke into the unit found Mr Ong, a Singaporean, and Madam Koh, a Malaysian permanent resident, seriously injured.
Both were taken to National University Hospital, but later died from their knife wounds.
Mr Ong's 2,047-word e-mail revealed the extent of his bitterness at his wife, her family and their maid. He claimed he had been forced to stop his studies, that his opinions were disrespected and his pride hurt.
Though the couple had known each other for 12 years, it appears that his resentment had been simmering for a while.
In a Facebook post last November, he wrote: "Finally bought what I needed to do what I have to do."
In December, he posted: "Let the devil get what the devil deserve in due date."
Yesterday, shortly after the maid had returned from walking the couple's son to his kindergarten, the attack began.
When Ms Corpuz rushed out screaming for help, cleaner Ramri Semass, 48, took her to the guardhouse, before calling the police around 7.55am.
"We covered her in blankets to stop the bleeding," he said.
She was taken to hospital and survived.
The attack has left the neighbours, who thought of the Ongs as a happy family, in shock.
Unknown to them, Madam Koh had approached a lawyer in July last year to file for divorce.
Madam Koh's lawyer, Mr Arul Suppiah, told The Straits Times that the couple's relationship had broken down.
"She couldn't stand (the fact) that he doesn't go to work and had depended on her financially for six years," he said.
Mr Suppiah had last met the couple at the Child Focused Resolution Centre on Tuesday for mediation. "There was nothing extraordinary about them. They had seemed normal," he said.
As for Mr Ong, his bitter letter yesterday contained only one note of apology, addressed to his son: "Son, sorry that you have to go through all these, I love you but your mum force me out of my limits (sic). Hope your new family can help you overcome the trauma."
This article was first published on January 31, 2015.
Get a copy of The Straits Times or go to straitstimes.com for more stories.