Dr. Adler gives Parker a new face to help him escape the wrath of the Outfit after the events in The Hunter. Although he has proved to be absolutely trustworthy, Wells, whom he has recently operated on, ends up killing him. 

Andrews is killed by George Uhl.

Angioni is killed in a tunnel collapse during the armory heist. 

Arnold is killed in a gunfight on the island. 

Ashby is killed by George Uhl.

After he is discovered to be a traitor to Major Indindu's mission, he is killed by Gonor, Fortumesca, and Manado. 

 Parker kills him. 

Becker ends up dead. 

Dr. Beiny ends up dead. 

Berridge is found dead in the safe house after the score. His drug-addled grandson, Manny, and his friend Jessup were counting on Berridge's cut from the job. Manny and Jessup kill Berridge and then proceed to travel across the country on a killing spree, looking for the cash from the heist.

Bobby was shot and killed in a gunfight at Norte's. 

Briley is shot and killed by Manny and Jessup. 

Brock is badly injured at the end of The Sour Lemon Score by Parker. After convincing Pam Saugherty to let him and Matt Rosenstein live, the three of them live together in a building in New York. Many years later, a now wheelchair-bound Matt Rosenstein stabs him to death in a rage. 

Parker kills him.

Bud is killed in the gunfight in Cockaigne. 

Dutch winds up dead. 

Parker kills him. 

She is found murdered by a giant decorative sword, and her murderer, an unnamed ex-boyfriend, makes off with the cash from the football stadium heist. 

Carlson is killed in a gunfight with the law in Palm Beach. 

Carmody ends up dead. 

Parker kills him.

He ends up dead. 

Clinger is shot by the law. 

He is killed by the law. 

Daask is killed in the gunfight in Connecticut. 

Dalesia is apprehended by the law in Ask the Parrot. Parker kills him in Dirty Money. 

Parker kills him. With a bow and arrow. 

Dulare winds up dead. 

It turns out Edgars was the chief of police in the town he arranged to rob, and he has an axe to grind. He dies in an explosion. 

After Feccio is shot and killed by the law, Little Bob comes after Parker, whom he blames for his friend's (and possibly lover's?) demise.

French ends up double-crossing Parker. Parker kills him in The Rare Coin Score. 

After successfully pulling the heist, Marty and two of the other criminals working on the heist are murdered by Roger St. Cloud. 

Parker kills him. 

He is killed by Brandon Williams. 

Gowan is killed by the CRDF. 

Grenholz is killed by Lloyd. 

Griffith commits suicide. 

He ends up dead. 

He wears a wire to a meeting of heisters, and when Parker discovers it he strangles him.

After Parker puts the kibosh on hiring him, Heenan goes to Baron and tells him about Parker's plan. Parker and Grofield kill Heenan on the island.

Herby is killed in a gunfight in Palm Beach.

Dr. Godden convinces Ralph to rob Parker's heist men after the Air Force base job with another patient, Roger St. Cloud. The score turns sour and Roger kills Ralph. 

Parker, Williams, and Marcantoni kill him. 

Jessup is traveling across the country on a killing spree with his companion, the druggie Manny, looking for the cash from the rock concert heist. Although the more put-together member of the duo, he is not the more dangerous. Parker kills him. 

Albert is killed by Manado. 

Lucille  is killed by Fortumesa and Manado once she has revealed the location of Lubudi's diamonds. 

He is killed by Fortumesca and Manado.

Kasempa is killed by Fortumesca. 

Ralph is killed by Fortumesca and Manado. 

Parker finds Evelyne dead in her apartment. She had been murdered by Manny and Jessup. 

Keegan is murdered and tortured by Jessup and Manny. 

Keenan is killed by McWhitney.

Kengle is killed by Roger St. Cloud. 

Kifka is shot and killed by Ellie's ex-boyfriend, an unnamed amateur. 

Kolaski is killed in a tunnel collapse during the armory heist. 

Lebotard is killed by Jack French.

Lempke ends up dead.