Col. Mark W. McDonough said Friday that Trooper Donald Crozier was terminated earlier in the day.
McDonough said the investigation into the Dec. 31 crash continues. Kathy Porter was killed in the crash. Her husband and two others were injured.
An accident report released Friday says the trooper's vehicle had all its emergency equipment activated and ran a red light while responding to assist another trooper who was involved in a pursuit.
The report said the trooper "failed to use due regard when traveling through the intersection."