The Ellen DeGeneres Show
(3 p.m., NBC10) - Jennifer Love Hewitt; the mother of a boy, 11, who committed suicide, aims to stop bullying in schools; Chicago performs.
Oprah Winfrey (4 p.m., 6ABC) - Marty Tankleff, wrongly accused of killing his parents, tells how it feels to finally be free.
Greek (8 p.m., FAM) - Homecoming Week finds the Kappa Taus and ZBZ teaming up against the Omega Chis and IKI in the float competition.
American Experience (9 p.m., WHYY TV12) - "The Living Weapon" chronicles U.S. efforts to create a biological weapons program in the 1940s and '50s in response to reports that Germany and Japan were developing their own.
The Closer (9 p.m., TNT) - Brenda and the squad have their hands full investigating a quadruple murder that may be tied to a case the FBI is involved with.
CSI: Miami (10 p.m., CBS3) - As Horatio and company investigate a murder at a boutique, he realizes that Julia has become seriously unstable.
Raising the Bar (10 p.m., TNT) - In the second-season premiere, Jerry defends a barber whose shop was the site of drug deals.
Late Show With David Letterman (11:35 p.m., CBS3) - Howard Stern; Mos Def performs.
The Tonight Show With Conan O'Brien (11:35 p.m., NBC10) - David Duchovny; Anna Friel.
Jimmy Kimmel Live (12:06 a.m., 6ABC) - Adrien Brody; musicians Steve "Lips" Kudlow and Robb Reiner; the Airborne Toxic Event performs.
The Late Late Show With Craig Ferguson (12:37 a.m., CBS3) - Kevin Bacon; ex-Cowboy Michael Irvin.
Late Night With Jimmy Fallon (12:37 a.m., NBC10) - Kelly Ripa; Mark-Paul Gosselaar; Amadou & Miriam perform.