According to the Daily Telegraph, police yesterday uncovered a network of pipes and gas bottles throughout the home, believed to have been installed by Manrique.
Neighbours have reported seeing the technology executive working on the roof with power tools over the weekend before the family’s deaths.
“He was right up on the roof replacing tiles and using power tools of sorts,” Neighbour Ofik Thomassian told News.com.au.
“He was cutting and banging and making all sorts of noise and pulling up tiles but I don’t really know what he was doing.”
A number of other neighbours have also confirmed seeing the father working on the roof over the weekend.
Police are currently looking into where the gas canisters were purchased or obtained.
Ms Lutz was said to be a devoted mother to her two children, and an active member of the school community and neighbourhood. Which is why when she didn’t show up for tuckshop duty on Monday morning, her two children were not at school and she could not be reached, alarm bells were raised.
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