A Kansas man called his girlfriend 18 times in a span of two minutes and messaged her, calling her a "b—," before shooting the 20-year-old dead at a party he told her not to go to, cops say. The young woman was killed just days before her birthday.

"It must have been her crazy boyfriend," a witness said at the scene, according to Kevin Calamaco-Morales's arrest affidavit . Kansas City Police officers captured the statement on body camera.

Calamaco-Morales, 22, is charged with first-degree murder and criminal discharge of a firearm in connection with Ana Juarez's death. Witnesses said Juarez was at a Halloween party during the early morning hours of Nov. 1 when Calamaco-Morales began "blowing up" her phone with calls and texts, according to the affidavit.

A person who was at the party to

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