A white supremacist "death squad" bludgeoned a Perth father to death in a twisted plot forged by his girlfriend and her lover to claim his life insurance, a court was told.

Alan Taylor, a fly-in, fly-out worker, was murdered on the morning of April 22, 2016 as he lay on his bed in his Girrawheen home.

Alan George Taylor was killed in his Girrahween home in April 2016.

His partner of nine years and mother of his child, Melony Attwood, her lover Robert Edhouse and their former housemate Corey Dymock - all members of white supremist group Aryan Nations - are on trial in Western Australia's Supreme Court accused of his murder.

State prosecution lawyer Justin Walley on Thursday told the jury during his opening address Ms Attwood and Mr Edhouse, who were both unemployed, "wanted Mr Taylor out of the way" so they could openly conduct their relationship, claim his life insurance and continue to live in his house.