Salvatore Miglino, 39, anticipated a confrontation when he went to pick his three-year-old son up from his mother-in-law’s home and so decided to record the handover.

Grandmother Cheryl Hepner, 66, allegedly pulled a gun on him outside her South Florida home, shooting him twice in the shoulder and rib cage with a .22 calibre Beretta handgun.

The iPhone, which appears to have been left on the front seat of Miglino’s car, captured the sound of gun shots but did not capture the actual shooting.

Mr Miglino can be heard screaming: “I can’t believe you did that! What, are you crazy?” as he jumps from the car, iPhone in hand.

He then reportedly wrestled the gun from Hepner’s hand before driving away and phoning the police.

"As evidence goes, that was a gem. That absolutely corroborated everything that Mr. Miglino had told detectives."

An affidavit filed after the incident states that Hepner “did knowingly and intentionally plan to kill and murder Mr. Miglino from a premeditated design.”

Why do people have to do these things to their own flesh and blood?
Such a shame.