An 88-year-old man who is the world’s longest-serving death row inmate has been acquitted by a Japanese court, after it found that evidence used against him was fabricated.

Iwao Hakamada, who was on death row for almost half a century, was found guilty in 1968 of killing his boss, the man’s wife and their two teenage children.

He was recently granted a retrial amid suspicions that investigators may have planted evidence that led to his conviction for quadruple murder.