Why did Nucky k*ll Jimmie

...because Jimmie tried having Nucky killed.

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Yeah, delete this please. It's very obvious why he executed Jimmy.

What could k*ll mean? It's such a well hidden censoring.

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Consider the daffodil. And while you're doing that I'll be over here looking through your stuff.

because he attacked him, and if a dog bites you have to put him down. No way around it. Kill that beast and get a new one.

...but they hung him anyway.
Hanged, Ami. Your father was not a tapestry.

Jimmy was a constant source of problems for nucky. It had to end

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Jimmie was a apparently a popular character, but let's face it, he was a total screw up.

- Was being groomed for greatness in Princeton by Nucky but runs away to war (yes, ran away - he didn't join up for patriotism) after beating up his professor and having sex with his mom.

- First thing he does on coming back is to rob Nucky's deal with A.R and start a war between Atlantic City and NYC.

- Comes back second time and goes direct to jail due to the poor planning of said robbery. Had to be saved by Nucky who had the accomplice snitch killed.

- Stays loyal for all of 2 episodes before starting to conspire with the Commodore to get rid of Nucky.

- Attempts to kill Nucky and fails.

- Attempts to kill mom and ends up killing dad instead.

- Betrays Manny Horvitz for absolutely no reason. He GAVE you the $5k. Mayer, Lucky and even Dolye were telling him to pay him already - instead tries to have him killed. This directly causes the death of his wife.

- Completely incompetent during brief time as top dog. Whole thing falls apart, losses all allies bar Harrow by the end.

There's nothing to do but put him into the ground by that stage.