A four-year-old girl pretended to be asleep in her Missouri home when her father allegedly shot her mother and half-brother and then turned the gun on himself.
Katrina Banks, 31, was found dead along with her son Kevin Johnson, 15 inside their Bellfountaine Neighbors, Missouri, home about midnight Thursday.
A man, identified as Dornubari Dugbor, 31, was also found dead with a self inflicted gunshot wound.
He and Banks had been engaged and were planning to get married in January.
The young girl pretended to be sleep in her room during the shootings, Bellefountaine Neighbors Police Chief Jeremy Ihler said according to St. Louis Post Dispatch reports.
The police chief said the child heard the first shots and came into the living room, finding her mother on the floor.
Dugbor was said to have told her to go back to her room, which she did.
'She heard several shots fired after that,' Ihler added.
Initially believed to be a triple homicide - based on bullet trajectory seemingly coming from the front door - Ihler asked for assistant from the Major Case Squad.
Dugbor was found dead bent over on the couch with his cellphone in hand while also having a 9mm semiautomatic pistol in his lap.
That helped lead authorities to believe that the deaths were the result of a murder-suicide.