UPDATE: 6:50am Major Crime Squad detectives have charged a man in relation to two deaths in Girrawheen on Wednesday.
Police were called to homes in Danbury Crescent and Arnos Way on Wednesday afternoon.
The body of Saso Filkovski, 37, was found at the Danbury Crescent home, and the body of Venesa Farcich, 31, was found at the Arnos Way home.
A 36-year-old man from Girrawheen has been charged with two counts of murder and will appear in the Joondalup Magistrates Court today.
Family and friends of the victims are struggling to comprehend the deaths.
Police found Mr Filkovski dead at his Danbury Crescent home about 3.30pm. Less than an hour later, Ms Farcich died inside her family home on Arnos Way, which on Sunday was the venue for her son's second birthday celebration.
Paramedics tried to revive Ms Farcich but she died at the scene.
The two homes are less than 100m apart.
Mr Filkovski still lived with his mother in the family's two-storey Danbury Crescent home, where he grew up. His father died in May 2011.
Ms Farcich's children are living with a grandparent.
Mr Filkovski was a personal trainer, accountant and IT consultant who operated a gym from his family home and a boxing ring at another property he owned across the road on Danbury Crescent.
Mr Filkovski's neighbour and close friend Ivan Peters fought back tears as he described the 37-year-old as being like his younger brother. "I was really shocked, I'm still shocked ... his dad ... just passed away," he said.
Mr Peters said he had been out when a friend told him of ambulances in the street.
"When he told me where it was, I burst into tears because I know the family very well," he said. "They're like my own family.
"The husband passed away and now the death of Saso as well. I don't know why life is so cruel.
"The mum is already going through so much stress because of the death of her husband - it's absolutely terrible."
Mr Peters said Mr Filkovski was passionate about the gym, did not smoke and hardly drank.
"He was one of the kindest people I have ever known. His whole family was very kind," he said.