A teenager killed a masked intruder holding a gun to mum's head - only to learn it was his dad.
Malachi Heisler shot his father John Heisler after he broke into the house to speak to his estranged wife.
"I had about five to six seconds to make a decision," said the 18-year-old.
"By the time I did recognise him, the decision was made."
Police
said Heisler, 46, forced his way into the home, smashing windows as he
went, while decked out in full black tactical gear, including a ski mask
and thigh holsters.