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MIAMI (AP) -- A home surveillance video shows a South Florida man accused of killing his wife and then posting a bloody picture of her body on Facebook walk away from a confrontation and then return a few moments later to fire a gun.

Man accused of killing wife, posting photo to Facebook

The weapon can't be seen in the video released Tuesday by the Miami-Dade State Attorney's Office to The Miami Herald. But the camera did pick up the swirl of gunpowder in the air from when authorities say 31-year-old Derek Medina fatally shot 26-year-old Jennifer Alfonso at their South Miami home last month.

Medina is charged with second-degree murder, but prosecutors will likely seek a first-degree murder indictment in the coming weeks.

Medina has claimed that his wife was the aggressor in the confrontation and that he was acting in self-defense.