Roger Hunt, who won the World Cup with England in 1966, has died at the age of 83.
Hunt is Liverpool's second leading scorer of all time with 285 goals in 492 appearances and a statement from the Premier League club read: "We are mourning the passing of legendary former player Roger Hunt.
"The thoughts of everybody at Liverpool Football Club are with Roger's family and friends at this sad and difficult time."
Hunt, who joined Liverpool in 1958, won the Second Division title with the club in 1962, two First Division titles in 1964 and 1966 and the club's first FA Cup in 1965, a year before glory with England. He scored 18 goals in 34 caps for his country. Hunt is Liverpool's record league scorer with 244 goals.
Liverpool manager Jurgen Klopp said: "It's really sad news and our thoughts and our love go to his family.
"Unfortunately, it feels too frequent in this moment we are saying farewell to these giants of our club.
"Roger Hunt comes second to no-one in his importance in the history of Liverpool FC, that much is clear.
"To be the goalscoring catalyst of the Shankly team to actually achieve promotion and then go on to win those precious league titles and the FA Cup puts him in a bracket of LFC legends who are responsible for making us the club we are today. Not only that, he was also a World Cup winner in 1966, too.
"I am told the Kop christened him 'Sir Roger' for all his achievements. A goalscorer who never stopped working to help his teammates; I believe he would have fit in well within our current team.
"So, it is Sir Roger we will remember, honour and pay tribute to over the coming days.
"You'll Never Walk Alone."
Hunt played in all six matches at the 1966 World Cup for Sir Alf Ramsey's England, and scored three goals. Sir Bobby Charlton, Sir Geoff Hurst and George Cohen are now the only living players from the England team that lifted the World Cup.