TV legend Steve Allen, best remembered as the original host of NBC's The Tonight Show, died of a possible heart attack at the Encino, Calif. home of his son Monday night. He was 78. Allen, who also headlined The Steve Allen Show from 1956 to 1961, starred as the King of Swing in the 1956 film The Benny Goodman Story. Additionally, he appeared on Broadway, released 40 albums and had his own newspaper column.