Police in Western Australia are continuing their investigation into a devastating double murder-suicide in Mosman Park, confirming that a second note found inside the family home is now being treated as critical evidence.

The discovery has become a central focus for investigators as they work to understand the circumstances surrounding the deaths and reconstruct the sequence of events that unfolded inside the residence.

According to Western Australia Police Force, officers located the additional document during a detailed forensic examination of the Mosman Park property. While an initial note had already been acknowledged, authorities say the second note raises further questions and may provide additional insight into motive, intent, or timing.

Police have not disclosed the contents of either note, citing the sensitivity of the case and respect for surviving relatives. Investigators emphasized that the documents are being carefully analyzed alongside forensic findings, digital evidence, and witness information.

The incident, described by police as a double murder-suicide, has shocked the tight-knit community of Mosman Park, an affluent coastal suburb where serious violent crime is rare. Emergency services were called to the home after concerns were raised, leading to the grim discovery inside.

Authorities have reiterated that there is no ongoing threat to the public. However, they stressed that the investigation remains active, with multiple lines of inquiry still underway.

Detectives say the second note could play a crucial role in clarifying unresolved aspects of the case, including the order of events and the mental state of those involved. At the same time, police caution against speculation, noting that written material must be interpreted within the broader context of the evidence.

As part of the investigation, police are continuing to speak with family members, associates, and neighbors, while specialist units assist with forensic and psychological analysis. Officials have not indicated when further details may be released.

The tragedy has prompted renewed discussion around family violence, mental health, and the warning signs that can precede such incidents. Support services have been made available to affected community members as authorities continue their work.

For now, investigators say their priority remains establishing an accurate and complete understanding of what happened inside the Mosman Park home — with the newly discovered second note forming a key piece of that effort.