"The Grim Sleeper" 8 tonight Lifetime — A reporter exposes a "Grim Sleeper" serial killer and a secret the police has kept for 20 years.

"Army Wives" 9 p.m. Sunday Lifetime — Cast recalls the seven seasons of the show.

"Cosmos" 9 p.m. Sunday Fox— A look at canine breeds and how they are related to wolves.

"The Walking Dead" 9 p.m. Sunday AMC — The group finds a place to establish new shelter.

"Crisis" 10 p.m. Sunday NBC (new series) — Students of the elite are kidnapped.

"The Mentalist" 10 p.m. Sunday CBS — A homicide at anfracking site is investigated.

"Revenge" 10 p.m. Sunday ABC — Emily's blackouts become destructive.

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Prosecutor Skandalakis has previously suggested that pursuing criminal charges against President Donald Trump may not be feasible until after he leaves office in 2029. (Craig Hudson/Politico/Bloomberg via Getty Images)

Credit: Bloomberg via Getty Images