McCoy Tyner, a cornerstone of John Coltrane’s groundbreaking 1960s quartet and one of the most influential pianists in jazz history, died on Friday at his home in northern New Jersey. He was 81.

His nephew Colby Tyner confirmed the death. No other details were provided.

Along with Bill Evans, Herbie Hancock, Chick Corea and only a few others, Mr. Tyner was one of the main expressways of modern jazz piano. Nearly every jazz pianist since Mr. Tyner’s years with Coltrane has had to learn his lessons, whether they ultimately discarded them or not.

Mr. Tyner’s manner was modest, but his sound was rich, percussive and serious, his lyrical improvisations centered by powerful left-hand chords marking the first beat of the bar and the tonal center of the music.

That sound helped create the atmosphere of Coltrane’s music and, to some extent, all jazz in the 1960s. (When you are thinking of Coltrane playing “My Favorite Things” or “A Love Supreme,” you may be thinking of the sound of Mr. Tyner almost as much as that of Coltrane’s saxophone.)