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Victim’s doc sickened by Lanza link

A Newtown pediatrician who lost a young female patient in the school massacre was stunned to learn he had a tie to her killer: His daughter bought and is living in the mass murderer’s former family home in New Hampshire.

Dr. Alexander Isgut, 71 — who cared for little Olivia Engel, 6, before she was slain by Adam Lanza — told The Post, “My daughter called me for other reasons that Friday morning, and I told her there has been a massacre here.

“At that time, the name Ryan Lanza [Adam’s brother] came on TV, and I told her, and she said, ‘Oh, my God, that’s the people I bought the house from.’

“My wife, she started to cry. She thought, ‘What would have happened if he got the [firearm] and decided to go back to his original home and kill everybody there?’ ’’

Isgut said his daughter bought the property in 1998 from the boys’ mom, Nancy Lanza, whom Adam killed in the rampage. Nancy’s brother — Adam’s uncle James Lanza — still lives next door.