Yankees fire Yankee Stadium security guard — an ex-NYPD detective — for stealing memorabilia

He slid out of a job — after getting caught stealing at Yankee Stadium.

A Yankees security official — and former cop — was fired by the Bronx Bombers for stealing team memorabilia, the Daily News has learned.

Former NYPD Detective Joe Flannino was caught lifting documents from a team archive room in the basement of the stadium, according to sources familiar with the situation.