The officer would have been sacked had he not already resigned, a police hearing concludes.
The A5 by Astcote, was closed for several hours after emergency services were sent to the scene.
Fuad Mohamud, 21, appears in court charged with murdering a 16-year-old boy.
The family of Cody Stock pay tribute to a "kind, funny and inspirational" young man.
Fuad Mohamud, 21, is due to appear at Northampton Magistrates' Court charged with murder.
Five officers' courageous attempt to rescue three people from a fatal house fire is recognised.
Northants country house is site of illicit weight-loss drugs seizure, a BBC investigation reveals.
Police welcome Joseph Hewitt's sentence, saying it reflects the "severity of his offending".
Matas Sukaitis, of Chaucer Close, Corby, is due to be sentenced on 18 September.
