U.S. Rep. Don Young (R-Alaska) died Friday night.

Rep. Young was the longest-serving member of the U.S. House of Representatives. Fox News reported that his death occurred while at the Los Angeles International Airport on his way home to Alaska.

Young was 88-years old and his cause of death has not yet been determined. Young had served in Congress since 1973 after winning a special election.

“It’s with heavy hearts and deep sadness that we announce Congressman Don Young, the Dean of the House and revered champion for Alaska, passed away today while traveling home to Alaska to be with the state and people that he loved,” a statement from Young’s office said.

“His beloved wife Ann was by his side,” it continued.

Young’s office confirmed that in the coming days they “will be sharing more details about plans for a celebration of his life and legacy.”