Russ Brandon, president of the NFL's Buffalo Bills and NHL's Buffalo Sabres, resigned from his post Tuesday.
Terry and Kim Pegula, who own Pegula Sports and Entertainment, which runs both teams, released a statement accepting Brandon's resignation. Kim will take over as president of the Bills and Sabres effective immediately while Terry continues to oversee team operations.
"We have a tremendous amount of confidence in the strong leadership teams we have built within each of those entities over the last several years," the Pegulas said in a statement. "We are excited about the direction of our teams, especially after this past weekend's NFL draft and NHL lottery results. Our focus remains on building championship teams on and off the field for our fans and community."
Brandon served as president of the Bills since 2013 and filled the same role for the Sabres since 2015, after the Pegulas bought the team. He had been with the Bills since 1997. Brandon spent three seasons from 2008-10 as the Bills' general manager, amassing a 17-31 record.
Brandon's resignation comes after the company conducted an internal investigation into his workplace behavior and allegations of personal misconduct, according to a report from The Buffalo News.
"I have been contemplating transitioning out of my role for some time," Brandon wrote in a statement. "My goal when the Pegula's purchased the franchise was to reach 20 years with the Bills in which I achieved this past November. Given where we are from a timing standpoint, particularly with the conclusion of the NFL Draft, now seems like the time to make that transition.
"As grateful as I am for the amazing experience and the incredible people I've had the privilege to work with the past two decades, I am just as anxious for the professional opportunities that lie ahead."
See Brandon while with the Bills and Sabres:
Former Bills, Sabres president Russ Brandon
Former Bills, Sabres president Russ Brandon
Buffalo Bills Operating Officer Russ Brandon (L) speaks with Buffalo Bills wide receiver Terrell Owens alongside him during a press conference at Ralph Wilson Stadium in Orchard Park, New York March 7, 2009. REUTERS/Gary Wiepert (UNITED STATES)
ORCHARD PARK, NY - AUGUST 28: General manager Doug Whaley of the Buffalo Bills talks to President and Chief Executive Officer Russ Brandon of the Buffalo Bills before the preseason game against the Detroit Lions at Ralph Wilson Stadium on August 28, 2014 in Orchard Park, New York. (Photo by Vaughn Ridley/Getty Images)
BUFFALO, NY - OCTOBER 08: Buffalo Sabres team president Russ Brandon attends a pregame rally before a game against the Ottawa Senators on October 8, 2015 at the First Niagara Center in Buffalo, New York. (Photo by Bill Wippert/NHLI via Getty Images)
ORCHARD PARK, Ny - JANUARY 03: Buffalo Bills president Russ Brandon and Buffalo Bills general manager Doug Whaley walk off the field before the first half between the New York Jets and the Buffalo Bills at Ralph Wilson Stadium on January 3, 2016 in Orchard Park, New York. (Photo by Michael Adamucci/Getty Images)
ORCHARD PARK, NY - JANUARY 14: Buffalo Bills president Russ Brandon speaks at a press conference announcing Rex Ryan's arrival as head coach of the Buffalo Bills on January 14, 2015 at Ralph Wilson Stadium in Orchard Park, New York. (Photo by Brett Carlsen/Getty Images)
ORCHARD PARK, NY - DECEMBER 27: Buffalo Bills president Russ Brandon walks onto the field with former Buffalo Bills running back Thurman Thomas before the game against the Dallas Cowboys at Ralph Wilson Stadium on December 27, 2015 in Orchard Park, New York. (Photo by Michael Adamucci/Getty Images)
NEW YORK, NY - JANUARY 1: Buffalo Sabres general manager Jason Botterill, owner Terry Pegula, and president Russ Brandon (L-R) pose during the 2018 Bridgestone NHL Winter Classic against the New York Rangers at Citi Field on January 1, 2018 in New York, New York. (Photo by Bill Wippert/NHLI via Getty Images)
ROCHESTER, NY - CIRCA 2011: In this handout image provided by the NFL, Russ Brandon of the Buffalo Bills poses for his NFL headshot circa 2011 in Rochester, New York. (Photo by NFL via Getty Images)
TORONTO, ON - JANUARY 29: Russ Brandon, President and CEO, Buffalo Bills, speaks to media after announcing a new multi-year partnership with Rogers at the Rogers Centre in Toronto, January 29, 2013. ANDREW FRANCIS WALLACE/TORONTO STAR (Andrew Francis Wallace/Toronto Star via Getty Images)
ORCHARD PARK, NY - OCTOBER 12: President and Chief Executive Officer Russ Brandon of the Buffalo Bills watches warm-ups before the first half against the New England Patriots at Ralph Wilson Stadium on October 12, 2014 in Orchard Park, New York. (Photo by Michael Adamucci/Getty Images)
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The Bills are fresh off their first playoff appearance since 1999 and selected highly touted quarterback Josh Allen with the seventh pick in last week's draft. The Sabres finished last in the NHL last season but won the lottery for the first pick in next month's NHL draft over the weekend.