The judge overseeing the state murder trial of Luigi Mangione, the man accused of gunning down UnitedHealthcare CEO Brian Thompson, ruled Monday that prosecutors can use a gun and a notebook as evidence.

Judge Gregory Carro’s ruling effectively rejected Mangione’s lawyers’ argument that those items were seized illegally, delivering a partial victory to prosecutors.

However, Carro said prosecutors cannot admit items found in Mangione’s backpack when he was arrested at a McDonald’s in Pennsylvania two years ago, including a loaded magazine, a passport and a wallet.

Authorities have previously described the red notebook found in his bag as a “manifesto.”

Mangione’s arrest came five days after Thompson, a 50-year-old father of two, was shot dead outside a Manhattan hotel as he walked to an investors’ conference. The daytime killing set off a frantic manhunt across the Northeast.

Mangione’s lawyers have argued that some of that evidence was obtained through unconstitutional searches and questioning, while prosecutors insist it was lawfully collected.

The 28-year-old defendant has pleaded not guilty to nine state felony charges, including second-degree murder and various counts related to his possession of a weapon.

“This type of premeditated, targeted gun violence cannot and will not be tolerated, and my office has been working day in and day out to bring the defendant to justice,” Manhattan District Attorney Alvin Bragg said in December 2024.

The state charges come with the possibility of life in prison. (New York does not have the death penalty after its capital punishment statute was ruled unconstitutional in 2004.)

Mangione has also pleaded not guilty in a separate federal case charging him with two counts of stalking, each carrying a maximum sentence of life without parole.

In both cases, prosecutors may highlight evidence found at the scene of Thompson’s killing. Authorities have said they recovered shell casings with the words “delay,” “deny” and “depose” written on them — terms associated with the practices of the for-profit healthcare industry.

The state trial in Manhattan Criminal Court is tentatively scheduled to begin in September, followed by a federal trial sometime later in the fall. Mangione has been detained at the federal Metropolitan Detention Center in Brooklyn since December 2024.