"We had no choice," Macagni said in video of an afternoon news conference posted by KCOY-TV. He said investigators had evidence "that demanded that we go out and take this officer off the street immediately."
Supervising officers were sent to make a felony arrest, but he struggled with them when they arrived, first putting up a physical fight, then firing his gun but hitting no one, Macagni said.
"He chose to resist, he drew his weapon, a fight ensued, he fired his weapon," the chief said.
Several officers came to help the police making the arrest, and one of them shot the suspected officer in the chest once, Macagni said.
Detectives had begun investigating the alleged relationship on Thursday night, and minutes before the shooting had confirmed that an "inappropriate" and "very explicit" relationship had been going on, Macagni said.
The shooting occurred on June 29, 2020 in Vallejo, California. A police officer, identified as Detective Jarrett Tonn, shot and killed his colleague, off-duty officer, Detective Sean Monterrosa, while responding to reports of looting at a Walgreens store.
The investigation is ongoing and there are conflicting reports about the events leading up to the shooting. Some witnesses claim that Monterrosa was kneeling and had his hands up when he was shot, while others say he was armed with a hammer. The police department has not yet released any statements or findings about the justification of the shooting.
The Vallejo Police Department has placed Detective Tonn on administrative leave and has not made any public statements about the incident. However, the department has faced criticism for their use of force and lack of transparency in previous cases.
The Solano County District Attorney's Office has launched an independent investigation into the shooting and will determine whether criminal charges will be filed against Detective Tonn. Additionally, the city of Vallejo has requested an outside investigation by the California Department of Justice.
This shooting has brought attention to the issue of police use of force and the potential consequences of officers not being properly trained in de-escalation techniques. It also raises questions about the culture within police departments and the need for better communication and accountability among officers.