The Staircase: Toni Collette says she spoke to Kathleen Peterson in her head before every death scene

Courtesy of HBO Max

In The Staircase, Toni Collette dies – a lot.

The Sky Atlantic show sees her playing Kathleen Peterson, the wife of American novelist Michael Peterson (played by Colin Firth) who was convicted of killing her and sentenced to life in prison in 2003, despite maintaining she had died after falling down the stairs.