The case of Donella Knox, jailed for four years for the murder of autistic daughter Ruby, mirrors New Zealand's most famous autism death - that of Casey Albury, a 17-year-old killed by her mother in 1997.
Janine Albury-Thomson, from Feilding, was tried for murder, and then convicted of manslaughter, and sentenced to four years' jail.
Albury-Thomson also felt she had run out of options - that any hope of happiness for Casey seemed impossible, so she did the unthinkable in an attempt to set her daughter free.
READ MORE:
• Why a loving mum murdered her autistic daughter
• Mum published book weeks before murder
• The Big Read: Tragedy behind mum driven to kill daughter
Following a public outcry, the New Zealand Court of Appeal reduced her sentence to 18 months.