The Simpsons (8pm, Fox) - Jonah Hill lends voice to a legendary prankster from Springfield Elementary who at age 19, shows Bart that he hasn't outgrown his mischievous ways.
Did the Mob Kill JFK? (8pm, Discovery) - On the 46th anniversary of John F. Kennedy's assassination, Discovery has two specials looking at his death. First, an examination of evidence suggesting a mob connection to the shooting, and then at 9pm, "JFK: The Ruby Connection" looks at motives of Jack Ruby in his murder of Lee Harvey Oswald.
American Music Awards (8pm, ABC) - Performers include Black Eyed Peas, Lady Gaga, Eminem, Janet Jackson, Whitney Houston, Carrie Underwood, Jay-Z, and many more. Michael Jackson is posthumously nominated for five awards.
Curb Your Enthusiasm (9pm, HBO) - In the one-hour seventh season finale, Larry misses out on time with Cheryl to do a favor related to the "Seinfeld" reunion.
The Oprah Effect (10pm, CNBC) - A look at how Oprah Winfrey can turn entrepreneurs into millionaires.