Warren Buffett's close friend and business associate is dead at 90. Here are 5 things to know about Walter Scott Jr.

Walter Scott Jr.NETNebraska

• Walter Scott Jr., a longtime friend and associate of Warren Buffett, died on Saturday.
• Scott was a Berkshire Hathaway director for more than three decades.
• He served as CEO of Kiewit, a construction group, and chairman of Level 3, a telecoms company.

Walter Scott Jr., a billionaire philanthropist and a close friend and business partner of Warren Buffett, died aged 90 on Saturday.

"You cannot find a better model for a citizen than Walter Scott," Buffett told the Omaha World-Herald in response to the news. "He was basically a builder, whether he was building Kiewit and physical things or building his vision of Omaha or Nebraska. He was nonstop."