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Hi from CNN. This is Madeline Thompson with five things you need to know for Monday, December 9.

26-year-old Luigi Mangione has been arrested and is being called a strong person of interest

in the fatal shooting of United Healthcare CEO in New York City last week.

That's according to multiple sources briefed on the matter.

Law enforcement officials say police in Altoona, Pennsylvania, picked up Mangione at a McDonald's and found

a gun similar to the one used in the homicide and multiple fake IDs, including one the

NYPD believes was used by the suspect.

CNN's John Miller has the latest.

People briefed on the investigation have told us that they have extracted DNA from a phone, from a water bottle that he drank from,

a power bar that he ate, and these things were discarded along the trail where he fled after the shooting.

Now, if this individual who's in custody is the person behind this crime, the DNA should match to the individual.

The print may match to the individual because you can't eliminate that somebody else didn't

handle the phone.

...