Mr Kaarma, a 29-year-old firefighter, has told investigators his home had twice been hit by burglars, and he told a hair stylist he had waited up at night to shoot intruders, prosecutors said.

On the night of the shooting, Mr Kaarma and his partner Janelle Pflager left their garage door open, and Ms Pflager left her purse in the garage in order to bait intruders, she told police.