Writing alongside his post, Ronan said: "No family should ever have to make an official statement of this nature, we thank you for your time and patience while we digested and composed ourselves after the upsetting events that transpired yesterday.".
He said the life of the Keating family had been changed forever and explained that while it's difficult for them to accept an apology, Harte had offered a letter expressing "genuine remorse".
The former Boyzone singer said: "The Keating family are surprised and hugely disappointed with the sentence and hope and expect the DPP to appeal the leniency of it.
Devastatingly, Ronan said his family will now never find peace: "We will continue to fight for Ciaran's justice.
Singer Ronan Keating has issued a new devastating statement after the man responsible for his brother's death was spared jail.
