NASHVILLE, Tenn. — Glen Campbell, the grinning, high-pitched entertainer whose dozens of hit singles included “Rhinestone Cowboy” and “Wichita Lineman” and whose appeal spanned country, pop, television and movies, died Tuesday, his family said. He was 81.

Campbell’s family said the singer died Tuesday morning in Nashville, and publicist Sandy Brokaw confirmed the news. No cause was immediately given. Campbell announced in June 2011 that he had been diagnosed with Alzheimer’s disease and that it was in its early stages at that time.

In the late 1960s and into the ’70s, the Arkansas native seemed to be everywhere, known by his boyish face, wavy hair and friendly tenor. He won five Grammys, sold more than 45 million records and had 12 gold albums and 75 chart hits, including No. 1 songs with “Rhinestone Cowboy” and “Southern Nights.”

His performance of the title song from “True Grit,” a 1969 film in which he played a Texas Ranger alongside Oscar winner John Wayne, received an Academy Award nomination. He twice won album of the year awards from the Academy of Country Music and was voted into the Country Music Hall of Fame in 2005. Seven years later, he received a Grammy for lifetime achievement.

He was among a wave of country crossover stars that included Johnny Cash, Roy Clark and Kenny Rogers, and like many of his contemporaries he enjoyed success on television. Campbell had a weekly audience of some 50 million people for the “Glen Campbell Goodtime Hour,” on CBS from 1969 to 1972. He gained new fans decades later when the show, featuring his cheerful greeting “Hi, I’m Glen Campbell,” was rerun on cable channel CMT.

He released more than 70 albums, and in the 1990s he recorded a series of gospel CDs. A 2011 farewell album, “Ghost on the Canvas,” included contributions from Jacob Dylan, Rick Nielsen of Cheap Trick and Billy Corgan of Smashing Pumpkins.

The documentary “Glen Campbell I’ll Be Me” came out in 2014. The film about Campbell’s 2011-12 farewell tour offers a poignant look at his decline from Alzheimer’s, while showcasing his virtuoso guitar chops that somehow continued to shine as his mind unraveled. The song “I’m Not Gonna Miss You” won a Grammy for best country song in 2015 and was nominated for an Oscar for best original song.

A sharecropper’s son and one of 12 children, he was born outside of Delight, Ark., and grew up revering country music stars such as Hank Williams. He was 4 when he learned to play guitar.

As a teenager, eager to escape a life of farm work and unpaid bills, he moved to Albuquerque, N.M., to join his uncle’s band and appear on his uncle’s radio show. By his early 20s, he had formed his own group, the Western Wranglers and moved to Los Angeles. He opened for the Doors and sang and played bass with the Beach Boys as a replacement for Brian Wilson, who in the mid-’60s had retired from touring to concentrate on studio work. In 1966, Campbell played on the Beach Boys’ “Pet Sounds” album.

He was married four times and had eight children. As he would confide in painful detail, Campbell suffered for his fame and made others suffer as well. He drank heavily, used drugs and indulged in a turbulent relationship with country singer Tanya Tucker in the early 1980s.

He is survived by his wife, Kim; their three children, Cal, Shannon and Ashley; and his children from previous marriages, Debby, Kelli, Travis, Kane and Dillon. He had 10 grandchildren.