A former South Carolina police officer, charged in the 2015 video-taped fatal shooting of a fleeing man, is expected to plead guilty to civil rights charges as soon as Tuesday afternoon on the eve of his federal trial, an official familiar with the matter said.

Michael Slager, 35, was charged last year in a three-count indictment in connection with the shooting of Walter Scott, 50, alleging that the North Charleston officer used lethal force without justification. The official, who was not authorized to publicly comment on the matter, declined to elaborate on the details of the plea deal.

A hearing has been scheduled for 2:30 p.m. in a Charleston federal court.

The April 4, 2015 incident, which began with a simple traffic stop, was captured on video and ultimately showed Slager shooting Scott as he attempted to flee from the scene on foot.

In the days after the shooting, federal prosecutors alleged that Slager "knowingly and intentionally misled'' state investigators in his account of the shooting.

The state's case against the officer ended in a mistrial last December.