The band expanded to a quartet and changed its name to "the Variatones" including the addition in 1954 of singer Francis Castelluccio (later known as Frankie Valli).

He was close friends with Joe Pesci, who introduced DeVito and Valli to keyboardist and songwriter Bob Gaudio.

By 1960 The Four Lovers consisted of DeVito, Valli, Gaudio and vocal arranger Nick Massi, and were mainly used as a backup band for producer Bob Crewe under contract.

He told the Las Vegas Review-Journal in 2009, "I had had it up to here with the traveling and changing clothes three times a day, and taking two planes and then driving 100 miles to do a date.

The reason for his departure was originally indicated as a hearing problem, but it was later revealed that he had accrued significant debt and financial trouble through gambling.

[12] DeVito later explained that he had grown tired with the traveling demands, and in 1970 he moved to Las Vegas where several siblings lived at the time.

[11] DeVito rejoined Valli and Gaudio (Massi had died in 2000) on stage at the 2005 Broadway opening of the documentary-style musical Jersey Boys, a Tony Award winning hit chronicling the story of the group's early days, which was later adapted to a 2014 feature film directed by Clint Eastwood.

His death was announced on Facebook by his friend, actor Alfred Nittoli, who stated that DeVito had recently been hospitalized after contracting COVID-19 amidst the COVID-19 pandemic in Nevada.