The UK’s worst pedophile was strangled with a guitar string, choked by pens and condoms, and stabbed during a grisly jailhouse slaying last year, according to a new report detailing his demise.

Richard Huckle was behind bars in Yorkshire for abusing more than 200 Malaysian girls and boys between the ages of 6 months and 12 years when he was killed in October.

“He wasn’t just stabbed. He was strangled with a guitar string,” a source told the Toronto Sun.

Police arrested an unidentified 29-year-old fellow convict in connection with the slaying, according to the paper.

Australian cops busted Huckle, 33, in 2014 as part of a wider probe into a since-shuttered pedophile website called “The Love Zone.”

Authorities discovered a trove of evidence on Huckle’s computer, including a manual he authored for other pedophiles on how to target vulnerable children.

“If I were to transfer my skills learned from India and tried to use them in the west, I wouldn’t last a month before I found myself in a cell,” Huckle reportedly wrote.

Huckle was handed 22 life sentences in 2016 on 71 sex abuse convictions.