Searching for answers about the Manhattan mass murders.

The lead starts right now.

The investigation into that deadly New York City office building rampage is now shifting to Las Vegas as police begin to trace the killer's final steps.

Today, new details about the gunman's weapon, his suicide note, and how surviving employees hid from the killer.

Plus, an audacious demand from Galane Maxwell, the woman serving 20 years in prison

for grooming young teen girls for Jeffrey Epstein and French.

Galeen Maxwell offering to give her testimony to Congress, but only under certain conditions

she has demands Ms. Maxwell, how House Republican Chairman is responding to her demands. That's ahead.

And don't miss with Texas, one person said. As residents get a say in Republican efforts to

redraw the maps, hear from a Democratic congresswoman who could very well lose her seat if her GOP colleagues get their way.

Welcome to the lead. I'm Jake Tapper.

We're going to start with the National League today.

Brand new details about that gunman's rampage in an office building in Midtown Manhattan yesterday afternoon,

where he murdered four innocent people and left one in critical condition before taking his own life.

Today, New York police are dispatching teams to Las Vegas, where the killer's from, and drove across country just days before the murders.

We're now seeing images of how employees inside 345 Park Avenue, their office

doors barricaded with couches once they learned an active shooter was inside. This all unfolded

yesterday evening just as the work day ended. Police say the gunman walked into the lobby of this skyscraper,

brandishing his weapon, and just opened fire. He shot an off-duty

police officer who was working security. He shot a woman as he entered. Then he went to the

elevator where he shot a security officer and another man. The gunman then let a woman coming

down the elevator escape the scene on Hunt before taking that elevator up to the 33rd floor,

...