The team marks the occasion by unraveling the death of a rideshare driver.

NCIShit a major milestone tonight withits 450th episode.

The next morning, Sam’s found dead with his car crumpled against a tree in Rock Creek Park.

NCIS “Unusual Suspects”Pictured: Brian Dietzen as Jimmy Palmer, Gary Cole as FBI Special Agent Alden Parker, Wilmer Valderrama as Special Agent Nicholas “Nick” Torres, Sean Murray as Special Agent Timothy McGee, and Katrina Law as NCIS Special Agent Jessica Knight.

Brian Dietzen as Jimmy Palmer, Gary Cole as FBI Special Agent Alden Parker, Wilmer Valderrama as Special Agent Nicholas “Nick” Torres, Sean Murray as Special Agent Timothy McGee, and Katrina Law as NCIS Special Agent Jessica Knight.Robert Voets/CBS

The mystery woman turns out to be an 85-year-old living in the Sunshine Pines retirement village.

“This love triangle just got really weird,” Parker (Gary Cole) announces.

So was he scamming them at the end of their lives?

Facility manager Nigel Yang takes McGee on a tour while Roman cozies up to a trio of gin-playing residents.

They explain that the facility’s been updated recently thanks to an anonymous rich guy named Mr. Greystone.

(Knight has to explain that shuffled board is a euphemism.

McGee pulls him into interrogation, and Yang claims to have lost his badge.

Sam wasn’t scamming; he was helping in honor of the grandmother who raised him.

(He also made his money back and more inThe Legend of Azaldirand donated that as well.

Good guy, Sam.)

And everything falls into place.

The downside of apprehending a murderer is that Grand Bubby gets shut down pending an investigation.

But hey, at least they’ll keep up their weekly Risk games.