Former Observer editor Donald Trelford dies aged 85

Journalist headed newspaper for 18 years and helped chess great Garry Kasparov write autobiography

Donald Trelford, the former editor of the Observer newspaper, has died aged 85, his family have announced.

The journalist, author and academic, who edited the Observer for 18 years between 1975 and 1993, died after a long illness on Friday in Mallorca, where he had lived for the past decade, said his wife, Claire.