In the wake of the Newtown massacre, PBS tackles the tough issue of guns with a series of programs. After Newtown: Guns in America (8 p.m., PBS/Ch. 7) looks at the evolution of guns in this country and how they're linked to violence in our society. Then Frontline (9 p.m., PBS/Ch. 7) airs the troubling report "Raising Adam Lanza," which looks into the background and possible motives of the Newtown shooter. This is the kind of reporting you're not going to find elsewhere on TV.Ironically, yet another show about serial killers premieres tonight. Cult (8 p.m., CW/Ch. 30) is a show-within-a-show in which real and fictional murders mix.Utah Matt Davis is very appealing as the guy trying to figure out exactly what's happening, but the pilot is a confusing mess.Elsewhere on TV ...NCIS (7 p.m., CBS/Ch. 2): Vance uncovers information that leaves him shaken.The Taste (7 p.m., ABC/Ch. 4): Contestants have to create the perfect sandwich.Betty White's Off Their Rockers (7 and 7:30 p.m., NBC/Ch. 5): More practical jokes.Raising Hope (7 p.m., Fox/Ch. 13): Sabrina is visited by the ghost of Arbor Day past, present and future.Heart of Dixie (7 p.m., CW/Ch. 30): Lavon helps Tom with his relationship.Men's college basketball (7 p.m., BYUtv): Utah State at BYUNBA (7 p.m., ROOT): Golden State Warriors at Utah JazzNCIS: Los Angeles (8 p.m., CBS/Ch. 2): Deeks and Kensi follow a suspicious trail.The Bachelor (8 p.m., ABC/Ch. 4): Sean talks about the season so far.Go On (8 p.m., NBC/Ch. 5): Ryan has a new assistant - Terrell Owens.New Girl (8 p.m., Fox/Ch. 13): Schmidt finds a new and highly coveted parking spot.Cougar Town (8 p.m, TBS): Buyers are looking at Grayson's house; Wade returns from Afghanistan.The Mindy Project (8:30 p.m., Fox/Ch. 13): Mindy is asked to host a medical segment on the local news.Vegas (9 p.m., CBS/Ch. 2): A actress makes life tough at the Savoy.Body of Proof (9 p.m., ABC/Ch. 4): In the season premiere, Megan returns to work several months after Peter's death. And deals with a serial killer.Pretty Little Liars (9 and 11 p.m., ABC Family): Detective Wilden tries to hide his secrets.Smash (9 p.m., NBC/Ch. 5): Julia and Tom are asked to work with a new collaborator.The Lying Game (10 p.m., ABC Family): Sutton is losing faith in her mother.Justified (11 p.m., FX): Raylan faces an old enemy who's out for revenge.White Collar (11 p.m., USA): Peter and Neal take different approaches to stop a pair of thieves.