From [HERE] Detroit police still don't know how an off-duty officer's holstered gun discharged and killed a woman who reportedly embraced him from behind during a backyard party, according to news reports.

Adaisha Miller -- who would have turned 25 today -- died of a single gunshot wound that passed through a lung and struck her heart early Sunday. Although the medical examiner ruled her death a homicide, Police Chief Ralph Godbee Jr. said a preliminary investigation indicates it was an accident, the Detroit Free Press says.

The shooting happened about 12:30 a.m. Sunday at the home of Officer Issac Parrish. Godbee said at a news conference that Miller was dancing behind Parrish and touching his waist when his department-issued Smith & Wesson M&P 40-caliber semi-automatic somehow fired.

Godbee said the Neoprene holster, being worn on the officer's right, was soft enough for the trigger to have been pulled with the gun stowed. The gun has an external safety but not an internal trigger safety, police said. For the gun to fire, the trigger, which requires 6.5 pounds of pull to discharge, must be pulled completely, Smith & Wesson says.

"Somehow, in the course of dancing with the individual to his rear and touching his waist, his Detroit Police Department-issued weapon discharged, striking Ms. Miller," Godbee said. "There is absolutely no indication that the officer placed his hand on his weapon at all."