Story highlights Suspected getaway driver faces three murder charges, authorities say

Suspects who were killed were 16, 17 and 19 years old

(CNN) Three teenagers dressed in black and wearing masks and gloves were killed by a resident when they broke into a home, Oklahoma authorities said Monday.

A fourth suspect, the alleged getaway driver, now faces first-degree murder counts in their deaths, authorities said.

The 23-year-old son of the homeowner fired the fatal shots from a AR-15 semiautomatic rifle, officials said. One suspect had a knife, and another carried brass knuckles.

"Preliminary investigation looks like it's self-defense," said Wagoner County Sheriff's Deputy Nick Mahoney, cautioning the investigation was continuing into the midday home invasion.

The shooter voluntarily spoke with investigators. Neither he nor his father was hurt.

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