Veteran actor David McCallum, most famous for playing medical examiner Dr. Donald ‘Ducky’ Mallard on the hit TV show “NCIS,” is dead.

David died Monday at New York Presbyterian Hospital, the result of natural causes … according to a statement from CBS.

The network is remembering David as “a gifted actor and author, and beloved by many around the world.”

CBS also says of David … “He led an incredible life, and his legacy will forever live on through his family and the countless hours on film and television that will never go away.”

David appeared in more than 400 episodes of “NCIS” on CBS … and he was also known for his work on the 1960s TV show “The Man from U.N.C.L.E.” … earning nominations for Emmys and Golden Globes.

In addition to his work in TV, David also landed roles in movies … including “The Great Escape,” “A Night to Remember,” “Mosquito Squadron,” “Freud,” and “The Greatest Story Ever Told.”

David is survived by his wife of 56 years, his three sons, his daughter, and his eight grandkids.

CBS says an upcoming 20th anniversary “NCIS” marathon will add an “In Memoriam” for David.

He was 90.

There was a lot of commotion in the moments after the Las Vegas cyclist was intentionally struck and killed … panic you can hear play out on the 911 call, made by the man’s Apple Watch.

In the audio, obtained by TMZ, you can hear 64-year-old Andreas Probst’s watch letting the 911 operator know he suffered a hard fall and was unresponsive.

What’s more terrifying is the growing panic and chaos that can be heard in the background during the call, the retired police chief was later pronounced dead at the hospital.

That wasn’t the only call from that day, however — remember, cops believe the 2 suspects also hit another cyclist about half an hour before Probst. In that 911 call, you can hear the 72-year-old man tell dispatch the attack was intentional … saying he could’ve been killed.

As we reported, 18-year-old Jesus Ayala, who was 17 at the time of the incidents, is now facing 18 counts, including murder … this after cops say he was the one behind the wheel when Probst was killed.

Footage from the Probst incident was filmed by 16-year-old Jzamir Keys, and it sparked serious outrage after going viral. Officers had a hard time tracking down Keys a month after Probst’s death, but he was eventually located and taken into custody, too.

Officials say Keys was behind the wheel during the non-fatal hit-and-run with the separate cyclist earlier in the day.

The Swifties seemingly rushed to get their Travis Kelce merch after Taylor was spotted supporting her new potential love interest at Sunday’s game … ’cause the Kansas City Chiefs superstar’s jerseys are flying off the shelves!!

TMZ Sports has learned — Kelce’s No. 87 threads were among the most popular items on the NFL Shop on Sunday … this according to Fanatics, the league’s official e-commerce partner.

“Yesterday, Travis Kelce was one of the top 5 selling NFL players and saw a nearly 400% spike in sales throughout the Fanatics network of sites, including NFLShop.com,” Fanatics tells us.

While it’s impossible to tell who exactly made all the purchases, the massive increase in jersey sales comes on the heels of the “Anti-Hero” singer’s visit to Arrowhead Stadium to watch the Chiefs whoop the Bears, 41-10.

So, yeah, it certainly feels like Taylor’s fanbase is ‘shipping’ the duo … and considering how passionate her following is, it wouldn’t be shocking if the Swifties emptied their wallets to secure their new favorite athlete’s jerseys.

Swift seemed right at home with Chiefs Kingdom as she watched the matchup in a suite alongside Kelce’s mom, Donna … despite being a longtime Philadelphia Eagles fan.

Swift and Kelce ended up leaving the stadium together … cruising away in his old-school convertible.