Update: Suspect now charged with first degree murder for Lake Madison shooting

Update 1:00 p.m.: Lake County State's Attorney Manny de Castro says there is enough evidence to charge Schmitz with first degree murder.

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Investigators believe the evidence recovered from the scene of a shooting death at Lake Madison is not consistent with the 911 call the suspect made the night of the incident.

46-year-old Joseph Schmitz is accused of killing a woman Wednesday night at a residence on Lake Madison. Authorities have not yet identified the victim, pending notification of the family.

An affidavit filed Thursday laid an outline of the investigation which led to Schimtz arrest.

Authorities received the 911 from Schmitz call around 10:30 p.m. Wednesday. According to the affidvait, Schimtz told the dispatcher that his fiance had tried to stab him, so he shot her.

Deputies with the Lake County Sheriff's Office, along with an officer from the Madison Police Department, responded to the home at 6233 North Lakeside Drive. When they arrived, they saw Schmidt standing outside the residence by the garage door. The deputies placed him in handcuffs and searched him. No weapon was found.

The officers then searched the home, and found the victim lying on a mattress in the living room with what appeared to be gunshot wounds. She did not have a pulse. They performed CPR on the victim until medical personnel arrived, at which point the woman declared dead.

During the investigation, authorities found a semiautomatic handgun between the mattress and the couch.

According to the affidavit, the victim had three bullet wounds to her chest, along with two wounds to her back. It is unclear if the wounds to her back were exit wounds or separate gunshot wounds. Officers found three shell casings and two bullets in the room.

A pocket knife with the blade exposed was found near the victim's right hand. Investigators say the knife appeared to be new and unused.

The affidavit states Schmitz did not have any injuries or defensive wounds, and that the victim appeared to be sitting on a mattress on the floor when she was shot.

Based on the positioning of the body, investigators say Schmitz would have had three different routes of escape if the victim had been trying to harm him. The firearm found at the scene had human blood on it.

According to the affidavit, investigators believe Schimtz' 911 call, in which he said "my fiance tried to kill me with a knife and I shot her," is not consistent with what was found at the scene.

Schmitz is facing a second degree murder charge. The case is still under investigation.