“The telephone rang. It was a nurse I know who works at the hospital. She said there was a very sick 5-year-old boy who wanted to see Santa Claus.

“I told her, ‘OK, just let me change into my outfit.’ She said, ‘There isn’t time for that. Your Santa suspenders are good enough. Come right now.’ ”

Schmitt-Matzen got to the hospital in 15 minutes. He met the lad’s mother and several family members.

“She’d bought a toy from (the TV show) PAW Patrol and wanted me to give it to him,” he said, voice growing husky. “I sized up the situation and told everyone, ‘If you think you’re going to lose it, please leave the room. If I see you crying, I’ll break down and can’t do my job.’ ”

Nobody entered with him. They watched, sobbing, from a hallway window in the Intensive Care Unit.

“When I walked in, he was laying there, so weak it looked like he was ready to fall asleep. I sat down on his bed and asked, ‘Say, what’s this I hear about you’re gonna miss Christmas? There’s no way you can miss Christmas! Why, you’re my Number One elf!

“He looked up and said, ‘I am?’

“I said, ‘Sure!’

“I gave him the present. He was so weak he could barely open the wrapping paper. When he saw what was inside, he flashed a big smile and laid his head back down.

‘“They say I’m gonna die,’ he told me. ‘How can I tell when I get to where I’m going?’

“I said, ‘Can you do me a big favor?’

“He said, ‘Sure!’

“When you get there, you tell ’em you’re Santa’s Number One elf, and I know they’ll let you in.

“He said, ‘They will?’

“I said, ‘Sure!’

“He kinda sat up and gave me a big hug and asked one more question: ‘Santa, can you help me?’

“I wrapped my arms around him. Before I could say anything, he died right there. I let him stay, just kept hugging and holding on to him.

“Everyone outside the room realized what happened. His mother ran in. She was screaming, ‘No, no, not yet!’ I handed her son back and left as fast as I could.

“I spent four years in the Army with the 75th Rangers, and I’ve seen my share of (stuff). But I ran by the nurses’ station bawling my head off. I know nurses and doctors see things like that every day, but I don’t know how they can take it.’”

Eric Schmitt-Matzen looks every bit the Santa Claus.

His 6-foot frame carries 310 pounds, leaving “just enough of a lap for the kids to sit on,” he says with a gentle Kringley chuckle right out of Central Casting.

No fake facial fuzz for this guy. Schmitt-Matzen’s snowy beard is the real thing, albeit regularly bleached to maintain its whiteness. His shag is so spectacular, in fact, it won first place in the “natural full beard, styled moustache” division of a 2016 national contest sponsored by the Just For Men hair products company.

He’s professionally trained. Custom-tailored in red. Was born on Dec. 6 (that’s Saint Nicholas Day — are you surprised?) Works approximately 80 gigs annually. Wife Sharon plays an authentic Mrs. Claus. His cellphone, with a Jingle Bells ringtone, continually counts down the days until Christmas. Even his civilian attire always includes Santa suspenders.