A 20-year-old Minnesota woman was reportedly killed in an attack prosecutors said was carried out by a male coworker who said he "did not like her."

In a criminal complaint filed last week and obtained by NBC affiliate KARE , prosecutors detailed allegations against 40-year-old David Bruce Delong, who they accused of killing Amber Czech, of Hutchinson, because he did not like her in an attack they believe he had planned for some time.

According to the Wright County Sheriff's office, the incident happened around 6 a.m. on Nov. 11 at Advanced Process Technologies in Cokato. There, officers were called to the scene for a woman found at her workstation with "significant head trauma."

Deputies arrived and tried to perform life-saving measures, but the woman was pronounced dead at the scene

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