Jailed Jamaican drug lord Christopher “Dudus” Coke was so ruthless that he once ordered a rival killed with a chainsaw, US authorities say.

Following a guilty plea in Manhattan federal court last year, Coke faces up to 23 years in prison at sentencing this week.

Coke, 43, has sought mercy in a letter to the judge — seven handwritten pages that in tone are formal and polite, but in substance barely touch upon a litany of accusations painting him as a cold-blooded killer.

But prosecutors say anyone who crossed Coke was detained and subjected to harsh punishments. One person accused of thievery “was brought to the ‘jail,’ tied down and killed by Coke with a chainsaw,” the court papers say.

Several women abused by Coke’s gang in Jamaica have written to the sentencing judge asking him to give the defendant a harsh punishment.