The woman stabbed to death in her Janesville home had invited a man into her house the night she died, according to a criminal complaint filed in Rock County Court on Wednesday.

Police are “exploring the possibility” the victim and the man were together for romantic purposes, said Lt. Terry Sheridan of the Janesville Police Department.

A criminal complaint filed Wednesday charges Julian D. Collazo, 21, with first-degree intentional homicide in the death of Christine Scaccia-Lubeck, 43.

The complaint was filed with a warrant that seeks extradition of Collazo from Missouri, where he was arrested Saturday.

Collazo was known to Janesville police as a gang member with no fixed address.

Scaccia-Lubeck was found in her bedroom with 33 knife wounds at the end of a trail of blood that led from the bathroom and down a short hallway, the complaint indicates.

Blood was on the floor, the walls and in large amounts around the body, the complaint states.

Scaccia-Lubeck’s sister told police she kept a handgun in the bedroom and another gun in the living room. The complaint doesn’t say if the guns were recovered.

Police don’t know how long Scaccia-Lubeck and Collazo knew each other or how they met, Sheridan said.

The complaint indicates Scaccia-Lubeck told her mother she “had a friend over” at her house at 426 S. River St. on Friday night, according to the complaint.

Scaccia-Lubeck told her sister in a phone conversation that “she had someone over” and “she was doing better and was talking about going out to the bars,” according to the complaint.

Those comments likely referred to Scaccia-Lubeck having been saddened by the death of her husband. Her family told police she had been coming out of her distress, Sheridan said.

Jacob D. Lubeck, 42, died Aug. 23 in Winnebago County, Illinois.

Scaccia-Lubeck and her sister had a short text conversation around 7 p.m. Friday, after Scaccia-Lubeck told her she had someone in the house.

The sister said she would call Saturday, adding “I want to hear everything tomorrow.”

Six minutes later, at 7:10 p.m., Scaccia-Lubeck replied: “OMG. Just found out he is 21.”

Her sister sent more texts, but Scaccia-Lubeck did not respond, according to the criminal complaint.

Scaccia-Lubeck’s mother last called her between 7 p.m. and 8 p.m., asking if she wanted to eat. She responded she was not hungry and had a friend over, according to the complaint.

The sister called the mother at about 4:30 p.m. Saturday, saying she was concerned that Scaccia-Lubeck was not answering her phone, according to the complaint.

The mother went to the house and found her daughter’s body. She called 911.

Police arrived, and the mother told them her daughter’s car should be in the garage. It wasn’t.

Collazo took the car and picked up Nicole R. Kazar, 23, at a gas station, according Kazar’s statements, as recorded in the complaint.

Kazar told investigators she had met Collazo five or six days earlier at Motel 6 in Janesville.

They split up Thursday afternoon, when Collazo said he was going to pick up clothing, she said.

Collazo called her Thursday night or early Friday morning and told her to meet him at the gas station and that he had a car, money and “everything,” according to the complaint, which doesn’t explain how that was possible if the stabbing took place Friday night.

Kazar said Collazo drove her to Beloit and appeared drunk. He told her he had killed a woman and stolen her car, according to the complaint.

He said he also stole about two cases of beer, debit cards, a handgun, an iPad, two Kindle tablets, a laptop computer and a Wii U game console, according to the complaint.

“Kazar said the defendant never told her how he killed the vehicle’s owner and said she continually told the defendant to stop telling her about it,” the complaint states.

The two stayed at her friend’s house and left Beloit the next morning, with Kazar wanting to go to Mississippi to see her son and Collazo wanting to continue on to Texas to see his family, according to the complaint.

The complaint states that a safe in the basement of Scaccia-Lubeck’s house was found empty and that Collazo told a fellow jail inmate in Missouri that he had killed a woman and that he had taken $3,000 from the house, among other items.

The inmate didn’t believe Collazo at first and asked what happened, “and the defendant said he had received a call from Kazar and that Kazar was upset that she heard another female with the defendant,” according to the complaint.

The inmate said “he got the impression that the defendant was protection for Kazar and that Kazar was a prostitute,” and that Collazo said “that he killed the lady to prove to Kazar that he could protect her,” according to the complaint.

Police believe Kazar may have been working as a prostitute, Sheridan said.

The inmate said Collazo told him he stabbed the victim in the bathroom, and she went to the bedroom, where she had a handgun, but she collapsed before getting the gun, according to the complaint.

Police have said they recovered bloody clothing in Scaccia-Lubeck’s car, and they found blood on the shoes Collazo was wearing when he was arrested.

Collazo and Kazar were arrested in Cape Girardeau, Missouri, on Saturday night, where they were charged with first-degree tampering with a vehicle and held on $50,000 bonds.

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