TWO years after Veronnica Baxter died in a men's jail, her brothers are still asking why.

A coronial inquest into Ms Baxter's death last week found she committed suicide at Silverwater in 2009, sometime between her single-cell door closing on March 15 and when it was opened the next morning.

Veronnica Baxter ... last days a mystery.

Greens MP David Shoebridge said questions remained about why Ms Baxter, a transgender Aboriginal woman, was put in an all-male facility when she identified as a woman, and why she was not given hormone medication prescribed to her.

Corrective Services policy states transgender prisoners should be put in a centre based on which gender they identify with - unless there are concerns for their safety or that of other prisoners. Mr Shoebridge will refer her death to a parliamentary inquiry with the power to call witnesses.