Authorities say a 34-year-old Utah police officer fatally shot his wife, mother-in-law and two young children before taking his own life.

Spanish Fork police say they went to Joshua Boren's house about 11 p.m. Thursday after he didn't show up to his night shift at the Lindon Police Department.

That's when they found Boren's 55-year-old mother-in-law Marie King dead in a bedroom, and Joshua Boren's immediately family dead in the bedroom next door.

The victims were identified as 32-year-old Kelly Boren, 7-year-old Joshua "Jaden" Boren and 5-year-old Haley Boren.

Spanish Fork Lt. Matthew Johnson says the couple had been experiencing marital problems in the past few months, but co-workers say Boren appeared upbeat and didn't show signs of distress before the killings.

Officials say they didn't find a suicide note.