The Life of Muhammad (7, 8 and 9 p.m., PBS/Ch. 7) is three one-hour documentaries airing back-to-back-to-back - none of which depict any images of Muhammad or any dramatic re-constructions of his life, in keeping with Islamic tradition.- "The Seeker" (7 p.m.) examines the world into which Muhammad was born, his marriage to his first wife, Khadijah, as well as his first revelations and the profound impact they had on his life and on the lives of those closest to him.- "Holy Wars" (8 p.m.) focuses on key events in Muhammad's life, including the Night Journey to Jerusalem, his departure from Mecca and the eight-year war with the Meccan tribes.- "Holy Peace" analyzes events during his later life, including the introduction of the moral code known as Shari'a and the concept of jihad. Elsewhere on TV ...Whose Line Is It Anyway? (7 p.m., CW/Ch. 30): Keegan-Michael Key is the guest. America's Got Talent (8 p.m., NBC/Ch. 5): A dozen acts perform in New York..So You Think You Can Dance (7 p.m., Fox/Ch. 13): The remaining eight contestants perform; two are eliminated.Rizzoli & Isles (7 and 9 p.m. TNT): Jane and Maura present the case of a serial killer at a law enforcement symposium.Big Brother (8 p.m., CBS/Ch. 2): The veto competition takes place.Capture (8 p.m., CW/Ch. 30): One contestant is carted off on a stretcher.Perception (8 and 10 p.m., TNT): An old flame surprises Pierce.Pretty Little Liars (9 p.m., ABC Family): ''A'' continues to manipulate Toby.Twisted (10 p.m., ABC Family): If you haven't kept up with the first 10 episodes, they're recapped in this hour.Who Do You Think You Are? (10 p.m., TLC): Chris O'Donnell learns about his family history.Covert Affairs (10 p.m., USA): Annie infiltrates an FBI investigation.Suits (11 p.m., USA): Cameron uses questionable tactics in Ava's case.