A Mastic Beach teenager stabbed and killed his mother’s ex-boyfriend early Monday morning after the man brandished a gun and attacked the woman inside her house, Suffolk County police said.

No arrests have been made and no charges have been filed as homicide detectives continue to investigate the case, police said.

Authorities said 48-year-old Norman Shields entered his ex-girlfriend’s Selden Road home at 3:45 a.m. and confronted her and her new boyfriend. Shields then brandished a gun, according to police, and started to assault 31-year-old Natasha Bivens but was stabbed to death by Bivens’ 13-year-old son who came to her defense, police said. Shields was pronounced dead at Brookhaven Memorial Hospital Medical Center in East Patchogue, police said.

The former couple’s 4-year-old child was also in the house but wasn’t injured, police said.

Anyone with information regarding the stabbing is asked to call the Homicide Squad at 631-852-6392 or Crime Stoppers at 1-800-220-TIPS.

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Rashed Mian has been covering local news for the Long Island Press since 2011. He graduated from Hofstra University in 2010 where he studied print journalism. Rashed, the staff's multimedia reporter, covers daily news for the web, shoots/edits feature videos and writes about civil liberties. He loves Afghan food and sports. Rashed is also a caffeine freak. Email: rmian@longislandpress.com. Twitter: rashedmian