A notorious murderer who worked for Colombian drug lord Pablo Escobar has died of stomach cancer, Colombian officials say.

Axar.az reports citing foreign media.

Jhon Jairo Velásquez, who boasted of killing 300 people for Escobar, was 57.

Known as "Popeye", he was released from prison in 2014 after more than 20 years and launched a YouTube channel, attracting more than a million followers.

But he was jailed again in 2018 on charges of extortion.

Velásquez died at the National Cancer Institute in the capital Bogotá, where he had been receiving treatment for stomach cancer since December.

He was a close associate of Escobar, who ran a drug trafficking empire from the Colombian city of Medellín that sent thousands of tonnes of cocaine to the US.

Velásquez gave himself up to the authorities in 1992 and spent 23 years in prison, reportedly gaining a reputation for the stories he told about his life of crime.

After his release he started a YouTube channel called Repentant.