WA Premier Roger Cook condemned the 'senseless' and 'horrific' murder of Jennifer and Gretl Petelczyc.

The mother and daughter were killed by a 63-year-old gunman searching for his ex-wife in Floreat, WA.

The gunman shot the women at their home before taking his own life.

Premier Cook called for more action against domestic violence and is considering tightening gun laws.

Police clarified that the victims were not related to the perpetrator, ruling out family violence.

Jennifer and Gretl were valued members of the University of Western Australia's Water Polo Club.

The club's members are struggling with the loss, urging the community to unite for a safer world.