Gary Humphries was ousted from his role as Liberal senator for the ACT in 2013. Photo: Melissa Adams

Former ACT Liberal senator Gary Humphries will become a deputy president of the Administrative Appeals Tribunal.

Attorney-General George Brandis will announce on Thursday afternoon he has appointed his former Senate colleague to the $460,000-year job on the federal tribunal.

Mr Humphries served as Liberal senator for the ACT from 2003 until he was deposed in a bloody coup by former leader of the local party Zed Seselja in early 2013. The split in the party caused by the knifing has still not healed.

Before entering the Senate, Mr Humphries had a stint as ACT chief minister after holding the attorney-general's job in the Carnell government.

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During his time in the upper house, the former lawyer became the first member of the Howard government to cross the floor over the issue of gay marriage in the ACT.

He rose to the position of shadow parliamentary secretary for families, housing and human services and shadow parliamentary secretary for citizenship.

Mr Humphries has worked as a lobbyist and newspaper columnist since leaving the Senate and as chairman of the Anzac Centenary Public Fund Board.

He declined to comment when contacted by The Canberra Times on Thursday.