Is Christopher Moltisanti going straight? The “Sopranos” character may have misgivings after the murder of his longtime love, Adriana. Don’t worry, though — “Chris-ta-fuh” remains in the bosom of Tony’s crime family. But Michael Imperioli, the actor who plays him, will join the cast of “Law & Order” for a short run while Jesse L. Martin appears in the movie version of the Broadway musical “Rent.”

“I’m glad to be on the right side of the law,” Imperioli says. He will play a young detective who’s the nephew and partner of Joe Fontana (Dennis Farina) for the final few episodes of “Law & Order’s” current season. In other words, look for him during the all-important May sweeps period. Meanwhile, on tonight’s “Law & Order” (9 p.m., NBC), a suspect in a rape case winds up on the wrong side of a speeding car’s bumper.

Tonight’s other highlights

• Scheduled on “60 Minutes” (7 p.m., CBS): GIs avoiding service in Canada; the growth of Christian pop music; Kevin Spacey discusses his portrayal of Bobby Darin.
• A new mystery surfaces on “Lost” (7 p.m., ABC).
• A Republican senator (new cast member Alan Alda) has his eye on Bartlet’s job on “The West Wing” (8 p.m., NBC).
• Would-be designers on “Project Runway” (9 p.m., Bravo).
• A case grows in Brooklyn on “CSI: NY” (9 p.m., CBS).
• A punk rocker and a religious wife trade families on “Wife Swap” (9 p.m., ABC).
• “Biography” (9 p.m., A&E) profiles Gene Simmons of rock band Kiss.

Series notes

Only four remain on “America’s Next Top Model” (7 p.m., UPN) … Lois Lane arrives on a two-hour episode of “Smallville” (7 p.m., WB).