A Somali national has been sentenced to life in prison for killing the mother of his child and three other people in North Dakota two years ago.

28-year-old Omar Mohamed Kalmio declined to comment following Tuesday’s sentencing, which lasted about 30 minutes.

Judge Douglas Mattson sentenced Kalmio to four consecutive terms of life in prison without the possibility of parole.

He was convicted of fatally shooting 19-year-old Sabrina Zephier at her home in Minot then killing her mother, her brother and her mother’s boyfriend at a nearby mobile home on Jan. 28, 2011.

Kalmio, who had a history of violent crime, was working in North Dakota’s oil patch at the time and said he was in the U.S. under political asylum.