Ive been thinking about this for a while, Jack McCoy says in Thursday’s episode.

Sam Waterstonhas vacated the D.A.

Jack became the assistant district attorney after season 17 and finally became the D.A.

Sam Waterston

Sam Waterston on ‘Law & Order’.Virginia Sherwood/NBC via Getty

ScandalstarTony Goldwynwill take over as district attorney on the series, as the showannounced earlier this month.

Heres howLaw & Ordersent off Waterstons Jack McCoy.

Thats preposterous, Jack insists.

Sam Waterston

Sam Waterston as Jack McCoy on ‘Law & Order’ season 11 and in 2023 and.Jessica Burstein/NBCU Photo Bank/NBCUniversal via Getty; John Nacion/Getty

Politics play absolutely no role in this office.

I invite the media to watch.

The mayor seemingly seeks to cover for his son, who was having an affair while on that trip.

I have an immense amount of respect for Jack McCoy.

More than I can possibly describe, the mayor tells executive assistant district attorney Nolan (Hugh Dancy).

But if you subpoena my son, I will bury you.

I will pull my support for McCoy, and use my immense power to confirm his opponent is elected.

But Jack isnt fazed by the mayors threats.

We cant let the mayors office dictate how we proceed, he tells Nolan.

He called me, right after your meeting.

Told me he was gonna pull his endorsement if you force his son to testify.

From there, Jack takes over the case, calling the mayors son as a witness.

The defendant is one of the richest men in the world, he says.

He donates billions of dollars to various charities across the globe.

Hes close friends with foreign dignitaries, movie stars, the mayor of New York.

By all accounts, he is a decent person.

Most of the time.

But on the morning of Dec. 12, he was not.

He was a killer.

And thats all that matters.

Jack continues with reflective, rousing remarks.

To always act with integrity, he tells the jury.

And to find the defendant, Scott Kelton, guilty of murder.

However, after the verdict, he tells Nolan that hes tendered his resignation and pours a drink.

Ive been thinking about this for a while, he says.

Jack goes on to explain how his decision may help protect his colleagues.

Look, the mayor is a vindictive son of a bitch, he says.

If I step aside now, the governor will be able to appoint someone.

Its been a hell of a ride, Jack reflects, as he and Nolan clink their glasses.

Law & Orderairs Thursdays at 8 p.m. ET/PT on NBC.