LOS ANGELES — Justin Turner and Keith Hupp met in a private hallway inside Dodger Stadium on Sunday night.

Hupp, a retired police officer wearing a Chase Utley jersey, was holding the baseball Turner used to end Game 2 of the National League Championship Series just a few minutes earlier. Turner, the Dodgers’ third baseman wearing a blue T-shirt with cut-off sleeves, was not.

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Updated Dodgers World Series roster and player profiles Turner wanted to make a trade. It could be anything, he said. Hupp hesitated.

“It’s hard for me to say in the moment,” he replied.

“Think about it for a while,” Turner said. “Let us know and we’ll get you.”

A moment later, Keith handed over the ball. A uniformed police officer, who escorted Hupp out of the bleachers, through the concrete pavilion, through the Dodgers’ bullpen and into the hallway, smiled and clapped. He volunteered to photograph the fan and the ballplayer together using Hupp’s smartphone.

Hupp, 54, retired from the South Gate Police Department in 2013 after attaining the rank of captain. He lives in San Gabriel, the city where he was born and raised. A Dodger fan since birth and a season-ticket holder for 10 years, Sunday was the rare occasion when he was able to attend a game with his son, 29-year-old Lindley.

Lindley Hupp gathered in close for a photograph with Turner and his father. Within a minute, Dodgers closer Kenley Jansen was in the hallway too, posing for photographs with the group.

The terms of the exchange were not yet clear.

“It’s just sometimes a little hard,” Keith Hupp said. “This is a big significant thing for me.”

“Me too,” Turner said.

Here’s Keith Hupp, the man who caught the Justin Turner HR tonight. (He also caught some big Cody Bellinger HRs.) pic.twitter.com/lTLGFXW0WU — JPS (@rsfpt) October 16, 2017

Turner had never ended a game with a home run in his life. In 32 years, 326 days and a lifetime’s worth of baseball games, he’d never experienced anything like Game 2 of the National League Championship Series, when his three-run home run against Chicago Cubs pitcher John Lackey capped the Dodgers’ 4-1 win.

Hupp had seen this before. He brought his glove for a reason.

Last Oct. 18, he caught Turner’s home run in Game 3 of the NLCS. That one, a sixth-inning moonshot against Jake Arrieta, landed nearly in the same spot as this one.

“That one was on the railing,” Hupp said. “This one was over the batter’s eye.”

Hupp said he moved about 12-15 feet to his left to catch Turner’s homer Sunday. He stretched out his left hand, extending a raggedy black leather glove over the black tarp covering the seats closest to dead-center field approximately 416 feet from home plate.

“I’m a lefty,” Hupp said. “I’ve dislocated my right shoulder so many times, I had to resort to my son’s glove on my left hand. So the last five or six home run balls I’ve caught, I’ve caught with my left hand.”

Hupp said he’s caught eight home runs on the fly in his life. He’s got another 16 in his private collection, all obtained one way or another.

He was at the game in San Diego on Sept. 3 when Cody Bellinger hit his 36th home run of the season, breaking the Dodgers’ franchise rookie record held by Mike Piazza. The day before, he bought Bellinger’s 35th home run ball off the fan who caught it. He wasn’t sure what to do with those baseballs in the moment, either, but he eventually arranged a trade with the Dodgers for a game-used Bellinger jersey.

“It was nice,” Hupp said.

By the time he was photographed with Turner in the hallway, Hupp had already posed with the baseball for dozens of awestruck fans with smartphones of their own. He could offer them his image and a small slice of the moment, which electrified the sold-out crowd and gave the Dodgers a 2-0 lead in the best-of-7 series.

For a man with 24 home-run balls in his personal collection, Hupp couldn’t offer much advice.

“Being very lucky,” he said. “And having a good glove.”