Maria Lutz, 43, Fernando Manrique, 44, and their two autistic children Elisa, 11, and Martin, 10, and the family dog, were discovered dead inside their Sydney home on Monday after a suspected murder-suicide.
Friends of Maria Claudia Lutz now say the mother-of-two barely spoke to her husband, as she was often left to care for their two children as he increased his trips overseas for work.
"Maria was doing everything alone. How she found the time to keep the house spotless with everything else she was doing was beyond me," a friend told The Daily Telegraph.
They said she was struggling to cope with the complex needs of her autistic children alone.
"Maria was so anxious and depressed that if [the Family of Community and Services] called to change an appointment or cancel [then] it threw her," the friend said.
"She would ring them sometimes nine times a day to confirm they had cancelled or changed things - or to ask for extra help. She felt completely alone and was a broken woman and depressed."
Mia Freedman says she feels "sick" about it. Listen to the Mamamia Out Loud Podcast here:
One of Lutz' friends spoke anonymously to Bogota's The City Paper earlier in the week claiming the 43 year old wanted to leave Australia.
"With a marriage struggling over constant worries of the future of their severely autistic children, Maria Claudia wanted to return to Colombia," they told the Daily Telegraph.
"The children could not travel due to their health issues on a 14-hour flight and in order to comfort Maria Claudia, her family would visit Australia once a year. She was going home this year, she decided."
The alarm was raised when the mother-of-two failed to show up for her regular tuck shop duties at St Lucy's School, which Elisa and Martin both attended.