The boyfriend of a Michigan woman who was shot and killed by Ann Arbor police over the weekend is speaking out about law enforcement’s’ failure to use nonlethal force to intervene in the ultimately fatal domestic dispute. Victor Stephens, whose girlfriend of nine months was living with him when she was shot in his home on Sunday, says he only called police for assistance escorting the woman (whose name has not yet been released) from the home, according to MLive.

“Why would you kill her? He shot her in the head and in the chest,” Stephens said. “It was a woman with a knife. It doesn’t make any sense.”

Police reportedly found the woman with a fish knife when they confronted her late Sunday evening, prompting one officer to fire at her. Stephens, who was in a separate room, did not witness the shooting, but did hear gunshots.

“Where were the Tasers at? She wasn’t going to kill anybody with a knife,” he said. “That’s unnecessary.”

Michigan State Police have announced an investigation into the shooting, about which few details have been released. As of Monday, law enforcement officials maintained that the officers responded with shots after the woman approached him with a weapon. According to Stephens, she has three children between the ages of 12 and 19.