As new details emerge about the Chicago surgeon accused of killing his ex-wife and her new husband in Ohio, investigators said they believe they've recovered the murder weapon.

One of multiple guns found in the Chicago condo of Michael David McKee has preliminarily matched to the scene of Spencer and Monique Tepe's shooting deaths, Columbus police Chief Elaine Bryant said at a news conference on Wednesday, Jan. 14.

"This was a targeted attack," Bryant said.

The Tepes were found shot dead in their home on Dec. 30. Their 1- and 4-year-old children were in the home, and crying but were physically unharmed, as was the couple's dog. McKee, who is Monique Tepe's ex-husband, was arrested in the Chicago area 11 days after the killings and was charged with premeditated murder in the case.

His attorney has said he will plead not guilty to the charges once he's extradited to Ohio and will remain silent.