UNITED STATES - Chuck Berry, who duck-walked his way into the pantheon of rock 'n' roll pioneers as one of its most influential guitarists and as the creator of raucous anthems that defined the genre's early sound and heartbeat, died on Saturday at his Missouri home. He was 90.

Police in St. Charles County, outside St. Louis, said they were called to Berry's home by a caretaker who reported he had fallen ill, and emergency responders found the performer unconscious. Emergency medical technicians tried to revive him with cardiopulmonary resuscitation, to no avail, and Berry was pronounced dead at 1:26 pm, police said.

Although Elvis Presley was called the king of rock 'n' roll, that crown would have fit just as well on the carefully sculpted pompadour of Charles Edward Anderson Berry. He was present in rock's infancy in the 1950s and emerged as its first star guitarist and lyricist.

Berry hits such as Johnny B. Goode, Roll Over Beethoven, Sweet Little Sixteen, Maybellene and Memphis melded elements of blues, rockabilly and jazz into some of America's most timeless pop songs of the 20th century.

He was a monumental influence on just about any kid who picked up a guitar with rock star aspirations - Keith Richards, Paul McCartney, John Lennon and Bruce Springsteen among them.

Bob Dylan called Berry "the Shakespeare of rock 'n' roll," and he was one of the first popular acts to write as well as perform his own songs. They focused on youth, romance, cars and good times, with lyrics that were complex, humorous and sometimes a little raunchy.

Both the Beatles and the Rolling Stones, as well as the Beach Boys and scores of other acts - even Elvis - covered Berry's songs.

"If you tried to give rock 'n' roll another name," Lennon once said, "you might call it 'Chuck Berry'."

When Richards inducted Berry into the Rock and Roll Hall of Fame in 1986, he said: "It's very difficult for me to talk about Chuck Berry because I've lifted every lick he ever played. This is the gentleman who started it all."

Berry's legacy as one of rock's founders was tarnished by his reputation as a prickly penny-pincher and run-ins with the law, including sex-related offenses after he achieved stardom.

Marking his 90th birthday in 2016 by announcing he would release his first album in 38 years, Berry listed T-Bone Walker, Carl Hogan of Louis Jordan's band and Charlie Christian from Benny Goodman's band as his guitar influences, but his lyrical style was all his own.

Berry came along at a time when much of the United States remained racially segregated, but it was hard for young audiences of any color to resist a performer who delivered such a powerful beat with so much energy and showmanship.