Four police officers have been sent behind bars by a High Court in Mombasa County.
The four who are accused of murdering British Alexander Monson were found guilty of manslaughter.
Naftali Chege, John Pamba, Charles Munyiri and Ismael Baraka were found to have been involved in the death of Monson who died while in police custody on May 19, 2012.
Judge Ogola sentenced Chege to 15 years in prison with Munyiri and Pamba each sentenced to 12 years, while Baraka was handed nine years respectively.
Ogola in his judgement said it was evident that Monson was tortured by the said police officers while in their custody where he acquired injuries including one on the head.
"I am satisfied that the death of the deceased was caused through unlawful omission on the part of the accused persons for failing to seek medical care for the deceased in good time," Ogola ruled.
He further ruled that Monson was brutally tortured and had cannabis planted on him after he died.
Ogola also said the officers had tried to cover up what had happened to the 28-year-old.
"Monson was under custody, yet they did nothing to avert his death. You let the deceased down in the hour of need," Ogola said.
Police arrested Monson for allegedly smoking cannabis in the Diani beach resort just south of Mombasa in May 2012.
The police initially said Monson had died of a drug overdose, but an inquest back in June 2018 found he had died from a head injury.
The deceased was the son of Lord Nicholas Monson and had moved to Kenya in 2008 to live with his mother, Hilary Monson.
Soon after the verdict, Hilary Monson said she was "disappointed" by the sentence given to police officers accused of killing her son.
Monson's family members were all present in the court for the ruling.