HBO documentary "Crisis Hotline: Veterans Press 1" explores the trauma and suicide epidemic in the military through the lives of crisis hotline workers. (HBO/Courtesy of HBO)

The group contemplates the future love triangle among Ted, Robin and Barney through flashbacks on “How I Met Your Mother” (CBS at 8 p.m.), while Lily and Robin issue a series of challenges to Barney.

An investigation of a model’s murder reveals that the victim’s main source of income was sperm donations on “Bones” (Fox at 8), but once they discover he falsified records, they begin to build a long list of probable suspects.

Caroline gets stood up after her date promised to take her to one of the city’s hippest new restaurants on “2 Broke Girls” (Fox at 8:30), so she and Max decide to take advantage of the exclusive dinner reservation.

“American Experience: JFK”(PBS at 9) is a four-hour portrait offering a fresh assessment of the enigmatic man, his accomplishments and his unfulfilled promise. The show features interviews with both Kennedy family members and historians.

“Crisis Hotline: Veterans Press 1” (HBO at 9) explores the epidemic of trauma and suicide among American war veterans, as seen through the work of the crisis hotline’s trained responders. According to the VA, one veteran dies by suicide in America every 80 minutes, and while only 1 percent of Americans has served in the military, former service members account for 20 percent of all suicides in the United States. Since 2001, more veterans have died by their own hand than in combat in Iraq and Afghanistan.

A popular relationship therapist is found dead on “Castle” (ABC at 10) and Castle and Beckett are on the case. But with time, the suspected motive for her murder shifts: The killer may not have sought her high-profile client list, but instead could have craved a rare, pricey object she possessed.

SERIES PREMIERE: “Church Rescue” (National Geographic at 10) introduces us to three business-savvy ministers, named Rev Kev, Gladamere and Doc, who travel the country helping faith-based organizations in the marketplace. They use the scriptures and a little Southern ingenuity to pull off some inspiring renovations.

Actress Julianna Margulies and Gen. Ray Odierno join the “Late Show With David Letterman” (CBS at 11:35), with a musical performance from Moon Taxi.

Actress Rebel Wilson and singer Kelly Clarkson come to “The Tonight Show With Jay Leno” (NBC at 11:35), with musical guest Lyle Lovett.

Actors Zooey Deschanel and Chris Elliott are on “Jimmy Kimmel Live” (ABC at 11:35), with musical guest Frank Turner.

— Rachel Lubitz