A white Connecticut police officer who fatally shot a Black man 30 seconds after arriving at the scene, where three fellow officers had spent several minutes trying to de-escalate the situation, was fired Friday.

Arunan Arulampalam, Hartford’s mayor, said in a statement that he terminated Officer Joseph Magnano effective immediately in connection with the 27 February shooting of Steven Jones, who was on a city street holding a knife. The killing came eight days after a different Hartford officer fatally shot another man in a mental health crisis.

“In the body-worn camera footage of the incident, as well as publicly shared videos, I saw three officers work together as a team to de-escalate a mental health crisis in a way that exemplifies the best of our police department,” Arulampalam said. “The actions of Officer Magnano do not measure up to those standards.”

A Hartford police spokesman referred questions to Chief James Rovella, who did not immediately return a phone message or email on 27 March. The police union did not immediately respond to an email message. The union has been defending Magnano’s actions, saying in social media posts that his use of force was lawful.