Michael Owen, a 27-year-old Marine, is charged with second-degree murder in the death of 27-year-old Kelly Owen.
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Authorities say the two were estranged since January of 2019 and had a prior domestic incident in December of 2018, but they were still maintaining a physical relationship.
They believe he strangled her after she told him she was pregnant with their second child.
WATCH: Briefing on arrest in murder of Kelly Owen on Long Island
Kelly Owen was found dead inside her family's home on 1st Avenue in South Farmingdale on January 15.
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Investigators said there were no obvious signs of a break in, and the medical examiner says she died from asphyxiation.
Michael Owen was reportedly involved with another woman where he lived in St. James.
Officials said he served as a U.S. Marine for eight years before being honorably discharged. His current job was with a company that installs cellphone towers.
He was remanded without bail.