Pete Wilder (Tim Daly):
"Private Practice" (Season 5, episode 22)
On the day of his court date for illegally taking a man off of life support, Pete goes for a run and suffers a heart attack. He lies there dead all day until a police officer finds him.
Also Read:Tim Daly Dismissed From ‘Private Practice’ for Season 6
Verna Thornton (Debra Mooney):
"Scandal" (Season 02, Episode 13)
Fitz (Tony Goldwyn) comes to hospital bed of the Supreme Court justice and strangles her after she tells him the truth about how the shenanigans behind his election win.
Lila Stangard (Megan West):
"How to Get Away With Murder" (Season 1, Episode 15)
Lila's murderer is a mystery the entire first season until the last seconds of the finale. Frank Delfino (Charlie Weber), working on behalf of Sam Keating, is revealed as her killer, proving that he is literally the only person on this this show that could keep his cool long enough to actually get away with murder.
Also Read:‘How to Get Away With Murder’ Creator on Finale’s Killer Reveal: ‘You Have to Pay Close Attention’
Mark Sloan (Eric Dane):
"Grey's Anatomy" (Season 9, Episode 2)
Surviving the plane crash, Mark gets a last "surge" of energy and fills out a medical directive, giving him 30 days in a coma before he can be unplugged.
Sam Keating (Tom Verica):
"How to Get Away With Murder" (Season 1, Episode 9)
Though his murder is previewed for the entire season, Sam's demise is more twisted than just a bloody killing. Law student Wes (Alfred Enoch) bashes him over the head with a trophy because he was attacking other members of the Keating 5 (not to mention he was cheating on Annalise with Lila and lying about it).
Also Read:‘How to Get Away With Murder’ Fans Take Over Twitter Asking #WhoKilledSam?