The search warrant, filed in Miami-Dade Circuit Court, revealed new details about the confession of Derek Medina, 31, who is charged with first-degree homicide in the death of Alfonso earlier this month, The Miami Herald reported.
In his confession, Medina said he grabbed his Bersa Thunder .380-caliber pistol and aimed it at Alfonso when she threatened to leave him during an argument.
After taking a knife out of her hands, he fired the gun multiple times.
"Mr. Medina then shot the victim six of eight times because she began to punch him," the warrant said.
Medina told police the episode was captured on an interior surveillance video system at the couple's townhome.
Police seized the video along with a stun gun, two other pistols, ammunition, a holster, two cellphones, three computers and an iPad.
Medina's arraignment is set for Aug. 29.