Red Sox President and CEO Larry Lucchino said Saturday he will be stepping down at the end of the season, ending a remarkable 14-year run that saw the team win three World Series titles in 10 years.

“Fourteen years in a 24/7 job is a lot. I’ll be 70 in September,’’ Lucchino told the Globe Saturday evening. “That’s sort of why I’m ready to step back.’’

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Lucchino’s departure will break up a famous ownership trio that also includes John Henry and Tom Werner.

Lucchino said his role as club president will be filled by Sox executive vice president and chief operating officer Sam Kennedy.

“Sam Kennedy is my choice to be the next president of the Red Sox when I complete my contract at the end of the year,’’ Lucchino said, when reached by the Globe Saturday evening. “This will be in effect when I complete my contract at the end of the season.’’

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Kennedy would take on only one of Lucchino’s roles, that of club president. According to sources close to the Red Sox, Werner is interested in taking over as club CEO. Werner, currently the club chairman, has been playing a more prominent role with the Sox.

Henry, the principal owner of the Sox and also the owner of the Globe, told WBZ that Lucchino “is a hall of fame baseball executive who has left an idelible mark on Fenway and the relationship between the Boston Red Sox and New England.” Henry also indicated his support for Kennedy’s moving in as club president.

He did not respond to e-mails from the Globe Saturday evening, nor did Werner.

Lucchino said of his plans, “We’ve been talking on and off. We planned to announce this before the end of the season. I’ll take a step back.’’

Lucchino has been in Major League Baseball since his mentor and boss, Edward Bennett Williams, bought the Baltimore Orioles in August of 1979. Lucchino won a World Series ring with the Orioles in 1983 and in 1992 oversaw the construction of Camden Yards, which changed the way big league parks were built. After leaving the Orioles, Lucchino ran the San Diego Padres for seven seasons and orchestrated the building of Petco Park.

Lucchino joined Henry when Henry purchased the Red Sox in December of 2001 and directed the $200 million renovation of Fenway Park.

It was Lucchino who famously characterized the New York Yankees as “The Evil Empire.’’

The ever combative Lucchino’s hard-charging style infuriated Yankee owner George Steinbrenner and many other owners, agents, and big league ballplayers.

While running the Padres, Lucchino hired Brookline High School classmates Theo Epstein and Kennedy as interns. When Henry’s group was awarded the Red Sox, Lucchino brought both young talents to Boston. Epstein became the youngest general manager in the history of baseball at the age of 28 in 2002, and under Lucchino and Epstein, the Red Sox broke an 86-year curse and won the World Series in 2004.

Lucchino was instrumental in the recruitment of Curt Schilling and many other baseball transactions during the Red Sox’ playoff run of the 21st century. He is also believed to be the man who blew up negotiations with free agent Mark Texeira, who signed with the Yankees before the 2009 season.

It was a feud with Lucchino that provoked Epstein to resign after the 2005 season. Epstein returned before the 2006 season, and the Sox won the World Series for a second time in 2007.

Lucchino’s clout in the Sox front office appeared to wane after the collapse of 2011 and subsequent firing of popular manager Terry Francona.

After the resignation of Epstein in the winter of 2011-12, it was Lucchino who overruled new GM Ben Cherington and hired Bobby Valentine as Sox manager. In the spring of 2014 Lucchino lowballed free-agent-to-be Jon Lester, and Lester was eventually dealt to Oakland at the trading deadline.

Most recently, Lucchino has been in charge of the proposed relocation of the Sox’ Triple A franchise from Pawtucket to Providence.

He remains an equity partner of the Sox ballclub and expects to remain a part of the Red Sox front office in his diminished role.

Dan Shaughnessy can be reached at dshaughnessy
. Follow him on Twitter @dan_shaughnessy.