Video shows Dylann Roof preparing for massacre

Prosecutors show jury video of Dylann Roof practicing with the gun he used to kill nine people inside Emanuel AME Church.

(NBC News) Federal prosecutors are expected to rest their case Wednesday against Dylann Roof, the 22-year-old accused of the massacre that left nine people dead inside a Charleston, South Carolina church.

Newly-released videos played in court show Roof taking target practice.

Investigators say he was carefully planning to carry out his rampage, and had even staked out Charleston’s historic Emanuel A.M.E. Church multiple times.

In court Tuesday they retraced his steps using GPS data, alleging he stopped at plantations and other historic sites in the months before the shooting.

Prosecutors laid out his racially inflammatory writings, photos of the Confederate flag and a potential hit list of other churches found in his car, along with surveillance video of Roof entering and exiting the church the night of the killings.

Roof is charged with 33 federal counts, including hate crimes.

His defense team has not disputed the facts of the case and has offered to plead guilty in exchange for the death penalty being taken off the table.

Prosecutors have refused.