MILACA -- A St. Cloud man is being held in the Mille Lacs County Jail on $500,000 bail after he allegedly shot and killed his 16-year-old sister at a hunting camp Friday.

According to the criminal complaint, 18-year-old Luis Rosa shot his sister twice after an argument over a malfunctioning heater in the camper.

Witnesses say his sister was arguing with Rosa's dad over the heater when Rosa stepped in and grabbed his sister by the throat. The father intervened and separated the two. Witnesses also say they heard Rosa say he was going to kill his sister before shots were fired.

Rosa's father told investigators his son shot his daughter in self defense after she "went crazy", got a knife and went after his son, cutting him in the stomach. Records show investigators determined a small cut on Rosa's stomach was too old to be from that night.

Investigators found a knife in the dead girl's hand, but witnesses also told police that Rosa's sister never had a knife during the argument.

Records show when investigators questioned Rosa, he admitted he shot his sister "because he was tired of her being mean to their dad."

The incident happened at a campground in the Rum River State Forest Friday.

Rosa has been charged with two counts of second degree murder.