MILLWALL conceded deep in stoppage time to plunge deeper into trouble at Huddersfield.
The Terriers and the Lions are both battling relegation and had been playing out a competitive but low-quality 0-0 draw at the John Smith Stadium.
But then substitute Rhys Healey headed home after 94 minutes to give the home side a huge three points.
Jake Cooper and George Honeyman were among those who missed big chances for the visitors while Huddersfield spurned opportunities of their own.