Diagnosis: Murder Season 4 Episode release dates & where to watch

1. Murder by Friendly Fire

One police officer is accidentally shot by another during a raid gone wrong. Dr. Sloan investigates the victim's wife, the shooter, and a conniving lawyer when he suspects foul play.

2. Murder Can Be Contagious

A burglar inadvertently becomes infected with a deadly virus. Dr. Sloan and Jesse are subsequently exposed to the virus after Jesse stumbles upon the thief's dead body. Both Mark and Jesse are confined to Mark's home while Steve and Amanda investigate the drug company that manufactured the virus, in the hopes of discovering an antidote before Jesse runs out of time.

3. Murder on Thin Ice

A figure skater hires her ex-coach to attack a rival skater. Dr. Sloan tries to prove her guilt.

4. X Marks the Murder (1)

Mark, Steve, et al, investigate a string of the so-called ""Casanova"" murders. Dr. Sloan loses his detached perspective when the killer begins calling Mark.

5. X Marks the Murder (2)

Mark, Steve, et al, investigate a string of the so-called ""Casanova"" murders. Dr. Sloan loses his detached perspective when the killer begins calling Mark.

6. A Model Murder

Dr. Sloan investigates a photographer, the overly protective mother of Jesse's friend's fiancée, in the murder of a private investigator.

7. Murder Can Be Murder

A respected cardiologist murders an innocent man in an insurance scam. Dr. Sloan reluctantly investigates his friend.

8. An Explosive Murder

A young undercover detective investigates a militia-type organization to solve a terrorist bombing witnessed by Mark. She has to decide whether to risk blowing her cover and warn Dr. Sloan of an attempt on his life or finish her assignment.

9. Murder by the Busload

A bus accident brings multiple victims into the hospital. Amanda does the bulk of the investigating when its discovered that a casualty in the accident was actually murdered.

10. A Candidate for Murder

His scheming advisor covers up the accidental death of the drug-addicted daughter of a U.S. Senator. Dr. Sloan and Amanda investigate.

11. The ABC's of Murder

An ADA sets out on a vendetta against an Asian youth, against both Mark and Steve's advice, after a drive-by shooting at a high school leaves one teacher dead.

12. Murder in the Family

Mark's daughter returns after eight years, leaving an abusive husband who later turns up dead.

13. In Defense of Murder

When a famous prostitute writes a tell-all book, an executive's job at Community General is in serious jeopardy.

14. A History of Murder

Mark investigates a 30-year old murder when the body of his old mentor is discovered entombed in a wall in the hospital.

15. Murder Two (1)

Jesse is arrested and charged with murder after a doctor testifying against Jesse in a malpractice suit is poisoned. Mark convinces his old friend, Ben Matlock, to defend Jesse.

16. Murder Two (2)

Amanda and Ben investigate the murder of Eric Spindler while Jesse continues to languish in jail.

17. Hard-Boiled Murder

Mark aids an old friend, Joe Mannix, in solving a 25-year-old, unsolved murder.

18. Murder, Country Style

When a musician is found murdered at a Country Music Awards ceremony, Dr. Sloan and company rush to find the culprit before the show ends and the crowd disappears.

19. Delusions of Murder

A devious psychologist uses hypnotism to facilitate his criminal acts, including the murder of his wife.

20. A Passion for Murder

An aggressive female pharmaceuticals representative stalks the hospital's new chief of staff after a one-night-stand, hoping to break up his marriage and have him all for herself.

21. Blood Brothers Murder

A beach boy involved with a gang member's sister is suspected of murdering him. Mark investigates.

22. Physician, Murder Thyself

Dr. Sloan investigates when an unpopular colleague drops dead while performing an operation. Mark investigates his fellow doctors when tests reveal the deceased was poisoned.

23. Murder in the Air

Dr. Sloan and Amanda investigate when the co-pilot of the airplance carrying them to a medical conference is murdered and the remainder of the flight crew are incapacitated with a mysterious illness.

24. The Merry Widow Murder

A wealthy woman and her boyfriend dupe Mark and plot to murder her husband.

25. Comedy is Murder

A bungling comedian seeks revenge on his former partner when he's cheated out of millions.

26. The Murder of Mark Sloan Finale

Dr. Sloan is stalked by a mad bomber whom he helped incarcerate. Norman and Mark are the main dissenters in negotiations to sell the hospital to a corporate raider.