Malaysiakini reported that her daughter, Dr Christina Blossom Welch, said Wong died at Kuala Lumpur Hospital after suffering a stroke caused by a brain haemorrhage.

Welch said the death was “fast and unexpected” as Wong seemed to be fine when her family brought her to the emergency department yesterday morning.

“She passed away earlier this morning. I was with her when she started to feel unwell. I was with her in the ambulance, and I was with her this morning,” she said.

Welch said a wake for her mother would be held on May 3 and 4 at Nirvana 2 in Kuala Lumpur, followed by a funeral on May 5.

Early in her career as a Special Branch officer, Wong worked undercover during the communist insurgency era.

She used the nickname “Blossom”, derived from her childhood hobby of planting flowers, as an alias while gathering intelligence on communist activities.

Wong also served in the Bukit Aman criminal investigation department’s “Black Cats” unit, tasked with dismantling prostitution and other vice syndicates operating in Kuala Lumpur.

She retired from the police force in 1993 after more than 36 years of service, having led Bukit Aman’s sexual violence, child abuse and domestic violence investigation division under the then inspector-general of police, Hanif Omar.