Bill Nighy

Film Deaths

Underworld (2003) [Viktor]: Head sliced in two with a sword by Kate Beckinsale. (His body is also shown in the 2006 sequel Underworld: Evolution when Derek Jacobi retrieves a key from Bill's body.)

Shaun of the Dead (2004) [Philip]: Dies of the zombie virus after being bitten on the throat by Keir Mills; he dies shortly afterwards while sitting in the car and talking to Simon Pegg, and comes back to life as a zombie a short time later. (Thanks to Dan and Michael)

Pirates of the Caribbean: At World's End (2007) [Davy Jones]: Playing an undead being, he is destroyed when his disembodied heart is stabbed by Johnny Depp (using Orlando Bloom's hand to do so); Bill then falls overboard into a whirlpool. (Although the ending of Dead Men Tell No Tales indictate that the character might make a return in the next instalment). (Thanks to Tina, Anton, Andrew, Bryan, and Hunter)

Valkyrie (2008) [General Friedrich Olbricht]: Executed by a firing squad. (Thanks to Tommy)

Glorious 39 (2009) [Sir Alexander Keyes]: Dies (off-screen) of old age/natural causes, at some point between the 1939 storyline and the present-day framing sequence. (Thanks to Tommy)

Harry Potter and the Deathly Hallows: Part 1 (2010) [Minister Rufus Scrimgeour]: Killed (off-screen) by Ralph Fiennes; we learn of his death afterwards when George Harris sends a message warning everybody at the wedding of Domhnall Gleeson and Clemence Poesy. (Thanks to Tommy)

Total Recall (2012) [Matthias]: Shot to death by Bryan Cranston's men as Bill and Colin Farrell try to access the kill code.

Wrath of the Titans (2012) [Hephaestus]: Sacrifices himself by letting Edgar Ramirez kill him in order to allow more time for Sam Worthington, Rosamund Pike and Toby Kebbell time to escape.

About Time (2013) [Tim's Father]: Dies (off-screen) from terminal cancer. He continues to be seen when his son (Domhnall Gleeson) travels back in time to visit him in the past.
Jack the Giant Slayer (2013) [Fallon]: Playing the voice of one of the heads of a two headed giant (along with John Kassir), Nighy is ripped apart from the inside after Nicholas Hoult throws a magic bean down Nighy's throat, causing a beanstalk to grow from inside their stomach.
The World's End (2013) [The Network]: Voicing the leader of a network of aliens attempting to take over the Earth, Bill self-destructs after arguing with Simon Pegg, Nick Frost and Paddy Considine. (Played for comic effect.)

I, Frankenstein (2014) [Naberius]: Descends to Hell after having the symbol of the gargoyle order carved on his chest during a battle with Aaron Eckhart. (Note: Bill is in heavy demon make up during his death scene)
Their Finest (2016) [Ambrose Hilliard/Uncle Frank]: In the film-within-the-film The Nancy Darling, "Uncle Frank" dies some time after being shot by a German plane while trying to cut a rope tied around the titular boat's propellor. ("Ambrose", the actor Bill plays, survives the film.)