Canterbury plant scientist David Lloyd fell severely ill in suspicious circumstances in 1992. The ensuing investigation became known as the 'poisoned professor case'.

When Canterbury scientist David Lloyd fell ill in 1992, suspicious immediately fell on his former lover.

Dr Vicky Calder was arrested in 1994 and stood trial twice for attempted murder, or alternatively poisoning with intent.

Lady Deborah Chambers QC presented The Trial - Crown vs Calder

Dr Calder was accused of poisoning Mr Lloyd with a chemical neurotoxin known as acrylamide.

He was in a coma for months and was left blind with severe nerve damage.

The first trial ended in a hung jury, the second jury found Dr Calder not guilty.

Lady Deborah Chambers QC, who presented a documentary called The Trial - Crown vs Calder, in 1997.

Go to this episode on rnz.co.nz for more details