LAS VEGAS — Roy Horn of Siegfried & Roy, the duo whose extraordinary magic tricks astonished millions until Horn was critically injured in 2003 by one of the act’s famed white tigers, has died. He was 75. Horn died of complications from the coronavirus on Friday in a Las Vegas hospital, according to a statement released by publicist Dave Kirvin. “Today, the world has lost one of the greats of magic, but I have lost my best friend,” Siegfried Fischbacher said in the statement.