Optus admitted up to 600 households in SA, WA and the NT were impacted by the triple-zero outage. Photo: Dean Lewins/AAP PHOTOS

A fourth person died after being unable to contact the triple zero emergency line during a 10-hour Optus outage, it has been revealed.

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The telco has confirmed a second death in Western Australia and says police informed them the person had likely attempted to call triple zero for help.

"I am deeply saddened by this further news and extend my heartfelt condolences to the person's family and friends," Optus CEO Stephen Rue said in a statement announcing the

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