Fired State Police detective Michael Proctor is continuing to stand by the investigation into the death of Boston police officer John O'Keefe. 

Proctor tells 20/20 that overall, he would not change a single thing about the investigation, and laughed when asked if he tried to frame Karen Read for the killing. 

Read was acquitted by a jury this week, and Proctor did not testify during the retrial. 

Proctor says the horrible text messages he sent about Read do not define him as a person. 

Proctor was fired for the texts and other behavior in the Read case, and is appealing the decision.