What to Watch on Saturday: Lifetime movie on JonBenet, new ‘SNL’

Who Killed JonBenet? (8 p.m., Lifetime) – This new movie is based on the true story of the unsolved murder of six-year-old JonBenet Ramsey in her Colorado home in 1996. Payton Lepinski plays JonBenet. The movie is followed by a two-hour special delving into the possibility that JonBenet’s mother, Patsy, might have been the killer.

Karen Carpenter: Goodbye to Love (9 p.m., Reelz) – A look at singer Karen Carpenter’s life and legacy through interviews with close friends.

Saturday Night Live (11:30 p.m., NBC) – Benedict Cumberbatch is the host, and Solange performs.

Austin City Limits (Midnight, UNC-TV) – Performances by Grammy winner Natalia Lafourcade and Latin funk orchestra Grupo Fantasma.