VIDEO: Detroit Cop Testifies About Fatal Raid

The Detroit Police tactical operator accused of negligently causing a 7-year-old's death testified Thursday that he constantly thinks about a shooting he said was accidental.

Joseph Weekley said he wasn't negligent in handling his MP5 subgun when he entered the lower flat of a residence on May 16, 2010 while searching for murder suspect, Chauncey Owens. During the dynamic entry, a flash-bang went off and Weekley encountered Mertilla Jones, who was sleeping on the couch with her granddaughter, Aiyana.

Weekley noticed movement under what he thought was laundry on the couch and pointed his weapon at it. That's when he testified that Mertilla Jones hit and pushed down his weapon and he heard a shot, reports the Detroit News.

"I replay this every day in my head," Weekley said. "There's nothing else I could have done differently."