Investigators said witnesses told them that Dennis Smith, an LSU fan, called Williams, a fan of the Crimson Tide, after the game Saturday evening and an argument ensued.
Officers said Donna Smith was a relative of Michael Williams' girlfriend.
Soon, the Smiths arrived at Williams' home and the men wound up in a physical altercation, officers said.
Smith retrieved a pistol from his vehicle, and threatened Williams, who armed himself with a shotgun and fired two blasts, striking and killing Dennis Smith, officers said.
Donna Smith then threatened Williams, who shot and killed the woman, they said.
Investigators said alcohol was believed to have been a factor in the killings, and the investigation was ongoing late Sunday.
What a shock. . .