Detectives questioned another suspect over the Easey Street double murder almost 50 years ago and "had no doubt" he killed the two women, a defence lawyer claims.

The bodies of Suzanne Armstrong, 28, and Susan Bartlett, 27, were found by a neighbour inside their home in Melbourne's Collingwood on January 13, 1977.

Details of the killings and near-50-year journey, before police extradited accused killer Perry Kouroumblis from Italy to face the two murder charges and one rape charge, were aired in Melbourne Magistrates Court on Wednesday.

Ms Bartlett was found fully clothed with 55 stab wounds, lying near the entrance to Ms Armstrong's bedroom, prosecutor Zubin Menon told the court.

Her housemate and long-term friend Ms Armstrong was found on her bedroom floor with a polka-dot nightie pu

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