S03E21: The Dead Pool
When a champion swimmer and Olympic hopeful is found dead in a training pool, Castle & Beckett dive in to investigate his murder, and uncover myriad secrets that might have led to his death.
Previous Episode 
Season 1
Flowers for Your Grave
S1E1 / 09 Mar 2009
Nanny McDead
S1E2 / 16 Mar 2009
Hedge Fund Homeboys
S1E3 / 23 Mar 2009
Hell Hath No Fury
S1E4 / 30 Mar 2009
A Chill Goes Through Her Veins
S1E5 / 06 Apr 2009
Always Buy Retail
S1E6 / 13 Apr 2009
Home Is Where the Heart Stops
S1E7 / 20 Apr 2009
Ghosts
S1E8 / 27 Apr 2009
Little Girl Lost
S1E9 / 04 May 2009
A Death in the Family
S1E10 / 11 May 2009
Season 2
Deep in Death
S2E1 / 21 Sep 2009
The Double Down
S2E2 / 28 Sep 2009
Inventing the Girl
S2E3 / 05 Oct 2009
Fool Me Once
S2E4 / 12 Oct 2009
When the Bough Breaks
S2E5 / 19 Oct 2009
Vampire Weekend
S2E6 / 26 Oct 2009
Famous Last Words
S2E7 / 02 Nov 2009
Kill the Messenger
S2E8 / 09 Nov 2009
Love Me Dead
S2E9 / 16 Nov 2009
One Man's Treasure
S2E10 / 23 Nov 2009
The Fifth Bullet
S2E11 / 07 Dec 2009
A Rose for Everafter
S2E12 / 11 Jan 2010
Sucker Punch
S2E13 / 18 Jan 2010
The Third Man
S2E14 / 25 Jan 2010
Suicide Squeeze
S2E15 / 08 Feb 2010
The Mistress Always Spanks Twice
S2E16 / 08 Mar 2010
Tick, Tick, Tick... (1)
S2E17 / 22 Mar 2010
Boom! (2)
S2E18 / 29 Mar 2010
Wrapped Up in Death
S2E19 / 05 Apr 2010
The Late Shaft
S2E20 / 12 Apr 2010
Den of Thieves
S2E21 / 19 Apr 2010
Food to Die For
S2E22 / 03 May 2010
Overkill
S2E23 / 10 May 2010
A Deadly Game
S2E24 / 17 May 2010
Season 3
A Deadly Affair
S3E1 / 20 Sep 2010
He's Dead, She's Dead
S3E2 / 27 Sep 2010
Under the Gun
S3E3 / 04 Oct 2010
Punked
S3E4 / 11 Oct 2010
Anatomy of a Murder
S3E5 / 18 Oct 2010
3XK
S3E6 / 25 Oct 2010
Almost Famous
S3E7 / 01 Nov 2010
Murder Most Fowl
S3E8 / 08 Nov 2010
Close Encounters of the Murderous Kind
S3E9 / 15 Nov 2010
Last Call
S3E10 / 06 Dec 2010
Nikki Heat
S3E11 / 03 Jan 2011
Poof! You're Dead
S3E12 / 10 Jan 2011
Knockdown
S3E13 / 24 Jan 2011
Lucky Stiff
S3E14 / 07 Feb 2011
The Final Nail
S3E15 / 14 Feb 2011
Setup (1)
S3E16 / 21 Feb 2011
Countdown (2)
S3E17 / 28 Feb 2011
One Life to Lose
S3E18 / 21 Mar 2011
Law & Murder
S3E19 / 28 Mar 2011
Slice of Death
S3E20 / 04 Apr 2011
The Dead Pool
S3E21 / 11 Apr 2011
To Love and Die in L.A.
S3E22 / 02 May 2011
Pretty Dead
S3E23 / 09 May 2011
Knockout
S3E24 / 16 May 2011
Season 4
Rise
S4E1 / 19 Sep 2011
Heroes & Villains
S4E2 / 26 Sep 2011
Head Case
S4E3 / 03 Oct 2011
Kick the Ballistics
S4E4 / 10 Oct 2011
Eye of the Beholder
S4E5 / 17 Oct 2011
Demons
S4E6 / 24 Oct 2011
Cops & Robbers
S4E7 / 31 Oct 2011
Heartbreak Hotel
S4E8 / 07 Nov 2011
Kill Shot
S4E9 / 21 Nov 2011
Cuffed
S4E10 / 05 Dec 2011
Till Death Do Us Part
S4E11 / 09 Jan 2012
Dial M for Mayor
S4E12 / 16 Jan 2012
An Embarrassment of Bitches
S4E13 / 23 Jan 2012
The Blue Butterfly
S4E14 / 06 Feb 2012
Pandora (1)
S4E15 / 13 Feb 2012
Linchpin (2)
S4E16 / 20 Feb 2012
Once Upon a Crime
S4E17 / 27 Feb 2012
A Dance with Death
S4E18 / 19 Mar 2012
47 Seconds
S4E19 / 26 Mar 2012
The Limey
S4E20 / 02 Apr 2012
Headhunters
S4E21 / 16 Apr 2012
Undead Again
S4E22 / 30 Apr 2012
Always
S4E23 / 07 May 2012
Season 5
After the Storm
S5E1 / 24 Sep 2012
Cloudy with a Chance of Murder
S5E2 / 01 Oct 2012
Secret's Safe with Me
S5E3 / 08 Oct 2012
Murder, He Wrote
S5E4 / 15 Oct 2012
Probable Cause
S5E5 / 29 Oct 2012
The Final Frontier
S5E6 / 05 Nov 2012
Swan Song
S5E7 / 12 Nov 2012
After Hours
S5E8 / 19 Nov 2012
Secret Santa
S5E9 / 03 Dec 2012
Significant Others
S5E10 / 07 Jan 2013
Under the Influence
S5E11 / 14 Jan 2013
Death Gone Crazy
S5E12 / 21 Jan 2013
Recoil
S5E13 / 04 Feb 2013
Reality Star Struck
S5E14 / 11 Feb 2013
Target (1)
S5E15 / 18 Feb 2013
Hunt (2)
S5E16 / 25 Feb 2013
Scared to Death
S5E17 / 18 Mar 2013
The Wild Rover
S5E18 / 25 Mar 2013
The Lives of Others
S5E19 / 01 Apr 2013
The Fast and the Furriest
S5E20 / 15 Apr 2013
The Squab and the Quail
S5E21 / 22 Apr 2013
Still
S5E22 / 29 Apr 2013
The Human Factor
S5E23 / 06 May 2013
Watershed
S5E24 / 13 May 2013
Season 6
Valkyrie (1)
S6E1 / 23 Sep 2013
Dreamworld (2)
S6E2 / 30 Sep 2013
Need to Know
S6E3 / 07 Oct 2013
Number One Fan
S6E4 / 14 Oct 2013
Time Will Tell
S6E5 / 21 Oct 2013
Get a Clue
S6E6 / 28 Oct 2013
Like Father, Like Daughter
S6E7 / 04 Nov 2013
A Murder Is Forever
S6E8 / 11 Nov 2013
Disciple
S6E9 / 18 Nov 2013
The Good, The Bad & The Baby
S6E10 / 25 Nov 2013
Under Fire
S6E11 / 06 Jan 2014
Deep Cover
S6E12 / 13 Jan 2014
Limelight
S6E13 / 20 Jan 2014
Dressed To Kill
S6E14 / 27 Jan 2014
Smells Like Teen Spirit
S6E15 / 17 Feb 2014
Room 147
S6E16 / 24 Feb 2014
In the Belly of the Beast
S6E17 / 03 Mar 2014
The Way of the Ninja
S6E18 / 17 Mar 2014
The Greater Good
S6E19 / 24 Mar 2014
That '70s Show
S6E20 / 21 Apr 2014
Law & Boarder
S6E21 / 28 Apr 2014
Veritas
S6E22 / 05 May 2014
For Better or Worse
S6E23 / 12 May 2014
Season 7
Driven
S7E1 / 29 Sep 2014
Montreal
S7E2 / 06 Oct 2014
Clear & Present Danger
S7E3 / 13 Oct 2014
Child's Play
S7E4 / 20 Oct 2014
Meme is Murder
S7E5 / 27 Oct 2014
The Time of Our Lives
S7E6 / 10 Nov 2014
Once Upon a Time in the West
S7E7 / 17 Nov 2014
Kill Switch
S7E8 / 24 Nov 2014
Last Action Hero
S7E9 / 01 Dec 2014
Bad Santa
S7E10 / 08 Dec 2014
Castle, P.I.
S7E11 / 12 Jan 2015
Private Eye Caramba!
S7E12 / 19 Jan 2015
I, Witness
S7E13 / 02 Feb 2015
Resurrection (1)
S7E14 / 09 Feb 2015
Reckoning (2)
S7E15 / 16 Feb 2015
The Wrong Stuff
S7E16 / 23 Feb 2015
Hong Kong Hustle
S7E17 / 16 Mar 2015
At Close Range
S7E18 / 23 Mar 2015
Habeas Corpse
S7E19 / 30 Mar 2015
Sleeper
S7E20 / 20 Apr 2015
In Plane Sight
S7E21 / 27 Apr 2015
Dead From New York
S7E22 / 04 May 2015
Hollander's Woods
S7E23 / 11 May 2015
Season 8
XY (1)
S8E1 / 21 Sep 2015
XX (2)
S8E2 / 28 Sep 2015
PhDead
S8E3 / 05 Oct 2015
What Lies Beneath
S8E4 / 12 Oct 2015
The Nose
S8E5 / 19 Oct 2015
Cool Boys
S8E6 / 09 Nov 2015
The Last Seduction
S8E7 / 16 Nov 2015
Mr. & Mrs. Castle
S8E8 / 23 Nov 2015
Tone Death
S8E9 / 08 Feb 2016
Witness for the Prosecution
S8E10 / 14 Feb 2016
Dead Red
S8E11 / 15 Feb 2016
The Blame Game
S8E12 / 22 Feb 2016
And Justice for All
S8E13 / 29 Feb 2016
The G.D.S.
S8E14 / 07 Mar 2016
Fidelis Ad Mortem
S8E15 / 21 Mar 2016
Heartbreaker
S8E16 / 04 Apr 2016
Death Wish
S8E17 / 11 Apr 2016
Backstabber
S8E18 / 18 Apr 2016
Dead Again
S8E19 / 25 Apr 2016
Much Ado About Murder
S8E20 / 02 May 2016
Hell to Pay
S8E21 / 09 May 2016
Crossfire
S8E22 / 16 May 2016
Nathan Fillion
Richard Castle
Stana Katic
Kate Beckett
Molly C. Quinn
Alexis Castle
Jon Huertas
Javier Esposito
Seamus Dever
Kevin Ryan
Susan Sullivan
Martha Rodgers
Tamala Jones
Lanie Parish
