Jeff Doucet opened a karate studio and was very attentive to his students, especially Jody Plauche. He gained the trust of the Plauche's and the community, leaving no one to suspect he was a monster who preyed on children.

SOURCES:
1) https://www.efootage.com/videos/90742/victims-father-shoots-attacker
2) https://www.wikitree.com/wiki/Plauche-35
3) https://www.nyu.edu/life/safety-health-wellness/campus-safety/you-matter--podcast/episodes/episode-93--jody-plauche--child-abuse-and-kidnapping-survivor.html
4) https://allthatsinteresting.com/jeff-doucet
5) https://www.rainn.org/news/grooming-know-warning-signs
6) https://allthatsinteresting.com/jody-plauche
7) https://www.themirror.com/news/us-news/my-dad-shot-rapist-karate-368140
8) https://criminalminds.fandom.com/wiki/Jeff_Doucet
9) https://www.nzherald.co.nz/world/man-opens-up-about-moment-his-dad-shot-dead-paedophile-who-abused-him/WL7NS5CCBPUVDFUTDSWKGQGHRI/