Christine McGuire, the oldest of the three McGuire Sisters, whose radio and television appearances and string of Top 20 hits in the 1950s made them one of the most popular female singing groups of their time, died Dec. 28 in Las Vegas, where she lived. She was 92.

Christine, Dorothy and Phyllis McGuire grew up singing in the First Church of God in their hometown of Miamisburg, Ohio. Their mother, a minister at the church, encouraged their interest in singing but would not allow the sisters to listen to secular music.

It wasn’t until the late 1940s, when the sisters were in their late teens and early 20s, that they added a few up-tempo pop tunes to their repertoire and began to appear as a vocal trio at veterans’ hospitals, benefits and other events. They were discovered by local bandleaders and radio stations in Cincinnati and Dayton, Ohio, and became known for their uncanny three-part harmony.

In 1952, the sisters pooled their savings and traveled to New York, hoping to audition for “Arthur Godfrey’s Talent Scouts,” a popular television show that was the “American Idol” of its time.

Godfrey was out of town, but a chance encounter led to a two-month engagement on the national radio broadcast of singer Kate Smith.

When the sisters finally performed for Godfrey, singing “Mona Lisa,” they won the contest and immediately became regulars on Godfrey’s top-rated radio and television shows. They had their first Top 10 hit in 1953 with a version of “Goodnight, Sweetheart, Goodnight,” followed the next year by “Muskrat Ramble.”

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The sisters’ biggest hit, “Sincerely” (originally performed by the Moonglows), was released in 1954 and spent 10 weeks at No. 1 on the Billboard pop chart. Their 1954 recording of Johnny Mercer’s suavely swinging “Something’s Gotta Give” soared to No. 5 on the Billboard chart.

As rock-and-roll began to filter onto the radio, the McGuire Sisters remained holdovers from an earlier, smoother musical era, along with singers such as Patti Page, Perry Como and Frank Sinatra.

The sisters toured constantly, recording a few minor hits, before striking gold again in 1958 with “Sugartime,” a fast-moving tune by Charlie Phillips and Odis Echols that begins, “Sugar in the morning, sugar in the evening, sugar at suppertime.”

The catchy number hit No. 1 and became the McGuire Sisters’ signature tune. At the height of their fame in the late 1950s, each sister was earning more than $1 million a year.

During the next decade, the sisters often performed on TV variety shows, always wearing identical gowns and hairstyles. But their brand of music increasingly sounded out of step with the times, and they stopped performing together after a 1968 appearance on “The Ed Sullivan Show.” In all, nine of their songs reached the Billboard Top 20.

The sisters’ public explanation for breaking up was to allow Christine and Dorothy to spend more time with their growing families. But matters were also complicated by Phyllis McGuire’s long affair with Chicago mob boss Sam Giancana.

They reportedly met in 1960, when Giancana forgave her gambling debt at one of his Las Vegas casinos.

“I just knew that I liked the man,” she told the Los Angeles Times in 1986. “His wife had passed away and he was very nice to me. And if he had done all those things they said he did, I wondered why in God’s name he was on the street and not in jail.”

She said he proposed marriage, but she turned him down. They remained close until Giancana was killed in 1975.