Yankees owner George Steinbrenner died this morning at age 80. He had owned the Yankees since 1973; the team won 11 American League pennants and seven World Series championships under his guidance. Details below, from ESPN:

George Steinbrenner died Tuesday morning, a person close to the longtime New York Yankees owner told The Associated Press.

The person spoke on condition of anonymity because the team had not yet made the announcement.

WABC-TV in New York reported that Steinbrenner, the Yankees' owner since 1973, suffered a massive heart attack.

According to reports, Steinbrenner, who celebrated his 80th birthday on July 4, was taken to a Tampa hospital after emergency crews responded to his home Monday night.

Read the full story at ESPN.com.