The conduct of this research came from the problem that those convicted of the most serious crimes in Thailand were earlier granted parole or release when compared to the gravity of their offenses, resulting in a high rate of recidivism for serious crimes. The research examines laws and practices concerning this issue of the European Court of Human Rights, the English courts, and the French courts, which is a sampling of study, including courts in other countries such as Australia, Canada, and New Zealand, and analyzes them with data obtained from in-depth interviews with both Thai and international experts in related f ields. The research has found it is crucial to develop the life imprisonment sentence by applying: 1) A life imprisonment sentence in which the convicted person must be imprisoned without the possibility of parole for the rest of his or her life. 2) A life imprisonment sentence in which the court specifies a minimum term of imprisonment before the convicted person becomes eligible for parole or release, as outlined in the judgment. This is to ensure that the convicted
individuals serve a minimum period proportionate to the gravity of their offense before being considered for parole or release. The research’s f indings also offer recommendations for enhancing trial, sentencing, and execution of life imprisonment sentences, encompassing both legal frameworks and court practices, as well as involvement from correctional and other relevant agencies throughout the justice process. These recommendations aim to ensure that the sentencing and execution of life imprisonment are appropriate, fair, and effective in achieving the objectives of criminal punishment while also contributing to a reduction in the rate of recidivism for serious crimes. This will ultimately enhance public safety.