A post mortem examination revealed he died from blunt force trauma to the head.
Police believe his wife killed him and then kept his body hidden in her flat for 18 years. They have launched an investigation into what they have described as "the perfect murder".
Leigh Sabine told neighbours she grew up in New Zealand and had escaped her violent husband.
She told others she had miscarried children, when in reality she dumped five of them in a New Zealand orphanage before pursuing a career as a nightclub singer.
Last week her son Steve said his parents abandoned him at the age of 6 or 7 before returning 17 years later in 1985.
Shortly after that reunion his parents again left him, his brother Martin and three sisters, Jane, Susan and Lee-Ann. The family only heard of their parents' fate again last week when police contacted them in New Zealand.
Steve Sabine was "overwhelmed" by the historic murder allegation but told British media: "If anyone was going to do it, she was going to do it."
Through the Givealittle page Jane Sabine said in the past she and authorities in New Zealand and the UK had searched unsuccessfully for any known family.
It wasn't until details were revealed in the media that family members made contact.
"All I have ever wanted is to feel connected and know my family, I knew there must have been some out there and I've held that hope for a lifetime," she said.
"They seem like lovely people and they themselves never knew we existed."
She aimed to raise $6000 for return flights to Wales and two weeks' accommodation.
"This is something I have spent a lifetime dreaming about and I hope with the generosity of some amazing people it may be achievable," she said.