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The Best Episodes of Diagnosis: Murder Season 4

Every episode of Diagnosis: Murder Season 4 ranked from best to worst. Discover the Best Episodes of Diagnosis: Murder Season 4!

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Dr. Mark Sloan is a good-natured, offbeat physician who is called upon to solve murders.

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Episode Rankings

  1. #1 Fan Favorite
    Diagnosis: Murder Season 4 Episode 1 - Murder by Friendly Fire
    7.9/10(108 votes)

    #1 - Murder by Friendly Fire

    S4:E1

    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.

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  2. Diagnosis: Murder Season 4 Episode 2 - Murder Can Be Contagious
    8.1/10(104 votes)

    #2 - Murder Can Be Contagious

    S4:E2

    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.

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  3. Diagnosis: Murder Season 4 Episode 3 - Murder on Thin Ice
    7.6/10(121 votes)

    #3 - Murder on Thin Ice

    S4:E3

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

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  4. Diagnosis: Murder Season 4 Episode 4 - X Marks the Murder (1)
    7.8/10(115 votes)

    #4 - X Marks the Murder (1)

    S4:E4

    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.

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  5. Diagnosis: Murder Season 4 Episode 5 - X Marks the Murder (2)
    7.5/10(103 votes)

    #5 - X Marks the Murder (2)

    S4:E5

    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.

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  6. Diagnosis: Murder Season 4 Episode 6 - A Model Murder
    7.2/10(102 votes)

    #6 - A Model Murder

    S4:E6

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

    Writer:Sam Egan

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  8. Diagnosis: Murder Season 4 Episode 7 - Murder Can Be Murder
    7.8/10(91 votes)

    #7 - Murder Can Be Murder

    S4:E7

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

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  9. Diagnosis: Murder Season 4 Episode 8 - An Explosive Murder
    6.8/10(119 votes)

    #8 - An Explosive Murder

    S4:E8

    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.

    Director:Steve Miner

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  10. Diagnosis: Murder Season 4 Episode 9 - Murder by the Busload
    7.9/10(109 votes)

    #9 - Murder by the Busload

    S4:E9

    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.

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  11. Diagnosis: Murder Season 4 Episode 10 - A Candidate for Murder
    7.5/10(97 votes)

    #10 - A Candidate for Murder

    S4:E10

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

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  12. Diagnosis: Murder Season 4 Episode 11 - The ABC's of Murder
    7.1/10(110 votes)

    #11 - The ABC's of Murder

    S4:E11

    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.

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  13. Diagnosis: Murder Season 4 Episode 12 - Murder in the Family
    7.9/10(114 votes)

    #12 - Murder in the Family

    S4:E12

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

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  14. Diagnosis: Murder Season 4 Episode 13 - In Defense of Murder
    7.8/10(109 votes)

    #13 - In Defense of Murder

    S4:E13

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

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  15. Diagnosis: Murder Season 4 Episode 14 - A History of Murder
    8.1/10(104 votes)

    #14 - A History of Murder

    S4:E14

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

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  16. Diagnosis: Murder Season 4 Episode 15 - Murder Two (1)
    7.5/10(137 votes)

    #15 - Murder Two (1)

    S4:E15

    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.

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  17. Diagnosis: Murder Season 4 Episode 16 - Murder Two (2)
    7.9/10(124 votes)

    #16 - Murder Two (2)

    S4:E16

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

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  18. Diagnosis: Murder Season 4 Episode 17 - Hard-Boiled Murder
    8.1/10(181 votes)

    #17 - Hard-Boiled Murder

    S4:E17

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

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  19. Diagnosis: Murder Season 4 Episode 18 - Murder, Country Style
    7.2/10(117 votes)

    #18 - Murder, Country Style

    S4:E18

    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.

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  20. Diagnosis: Murder Season 4 Episode 19 - Delusions of Murder
    7.9/10(111 votes)

    #19 - Delusions of Murder

    S4:E19

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

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  21. Diagnosis: Murder Season 4 Episode 20 - A Passion for Murder
    7.7/10(105 votes)

    #20 - A Passion for Murder

    S4:E20

    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.

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  22. Diagnosis: Murder Season 4 Episode 21 - Blood Brothers Murder
    6.7/10(106 votes)

    #21 - Blood Brothers Murder

    S4:E21

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

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  23. Diagnosis: Murder Season 4 Episode 22 - Physician, Murder Thyself
    8.1/10(137 votes)

    #22 - Physician, Murder Thyself

    S4:E22

    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.

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  24. Diagnosis: Murder Season 4 Episode 23 - Murder in the Air
    8.2/10(108 votes)

    #23 - Murder in the Air

    S4:E23

    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.

    Director:Tom Chehak
    Writer:Tom Chehak

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  25. Diagnosis: Murder Season 4 Episode 24 - The Merry Widow Murder
    8.1/10(117 votes)

    #24 - The Merry Widow Murder

    S4:E24

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

    Director:Oz Scott

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  26. Diagnosis: Murder Season 4 Episode 25 - Comedy is Murder
    7.4/10(134 votes)

    #25 - Comedy is Murder

    S4:E25

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

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Season 4 Ratings Summary

"Murder by Friendly Fire" is the best rated episode of "Diagnosis: Murder" season 4. It scored 7.9/10 based on 108 votes. Directed by Christian I. Nyby II and written by Gillian Horvath, it aired on 9/19/1996. This episode is rated 0.2 points higher than the second-best, "Murder Can Be Contagious".