TV top picks

6 p.m. on SHOW Active Shooter: America Under Fire The season finale, “Columbine, Colorado,” looks back at an April 1999 event that remains shocking nearly two decades later, when disaffected senior high school students Eric Harris and Dylan Klebold heavily armed themselves and murdered 12 students and a teacher, wounding 21 others before eventually committing suicide. Subsequent investigation into the bloody incident revealed that the pair actually had intended their attack to rival the carnage of the 1995 Oklahoma City bombing by Timothy McVeigh. 7 p.m. on SHOW Tim & Faith: Soul2Soul Country music lovebirds Tim McGraw and Faith Hill, pictured, have thriving solo careers, but they love to tour together when they can. This new concert film from Magical

Elves filmmakers Dan Cutforth and Jane Lipsitz follows the first tour the couple, married for more than two decades, has taken together since 2007, when they took a break to raise their three daughters. Filmed last summer during the couple’s 60-plus-stop tour, this documentary includes both performance footage and offstage scenes. 8 p.m. on FOX The Exorcist Marcus and Tomas (Ben Daniels, Alfonso Herrera) start the exorcism in the new episode “Help Me,” with all the residents of the foster home potentially affected by however the process turns out. The supernatural enemy is so powerful, the two priests find themselves in uncharted territory in trying to vanquish it. Guest stars include Alicia Witt and Hunter Dillon. John Cho and Li Jun Li also star.