Canadian farmer Robert Latimer killed his extremely disabled child by putting her in his truck and running a pipe from his exhaust into the cab. Latimer fully admitted his guilt and claimed that, by killing her, he freed her from her chronic pain due to her severe form of cerebral palsy. His daughter was a full quadriplegic and required numerous surgeries to maintain her quality of life. She could not feed herself and was in constant pain despite painkillers she was given. Despite her condition, she was able to sporadically smile and respond to some stimuli. Later in the year, Latimer was convicted of first-degree murder. A year following this, his sentence was lowered to second-degree murder. Latimer, through many different trials and appeal processes was eventually released in 2008 as he was not deemed a danger to society. His case brought up many questions in regards to the law such as euthanasia, mercy killing and how it would affect other mandatory sentences for murder. The case itself calls to attention an argument made by philosopher John Stuart Mill relating to harm and liberty. He brings to light his harm principle and draws attention as to what liberty should be. In this essay, Mill’s argument for the harm principle will be explained and evaluated.