ARVADA, Colo. (CBS4) – One person was killed in an assault and the alleged attacked died in an officer-involved shooting at an apartment building in Arvada early Friday morning. Police responded to the Venice Square building, located at 5360 Everett Street, just after 5 a.m.

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When police arrived they said they found a threatening man with a knife. There was a confrontation and the man was shot and killed by officers. A woman’s body was found in the man’s apartment shortly afterwards. A third person, a man, was present in the apartment and was the one who had called for help. He wasn’t hurt.

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“This is always one of the most dangerous types of calls officers can go on, especially in this case when they’re predisposed with some type of information that it already is at a high level,” said Dave Snelling, a spokesman for Arvada police.

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Authorities said they believe the man and the woman were in a relationship and that this was a case of domestic violence.

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The names of the people involved haven’t been released. The exact nature of the woman’s death hasn’t been explained.