A 68-year-old grandfather was mowed down by a wrong-way moped driver as he crossed at a Queens intersection — just days before he was to bring his daughter home for Christmas, his family told The Post.

Trevor Lloyd Samuels, a former correction officer from the island of Jamaica, was walking in the crosswalk on 93rd Avenue shortly after 6:30 p.m. Friday when he was struck and killed by the two-wheeled menace, a spokesperson for the NYPD said Sunday.

The tragedy left his family devastated.

“When we heard a knock, we thought it was him coming home, I was like, ‘Why is he knocking? He has keys,'” the dead man’s oldest daughter, Kievette Samuels, 45, said Sunday. “When I opened the door, I saw the uniform, I was like, ‘Oh no’. That’s when panic mode set in.

“They said he was involved in an

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