"Her parents died from gunshot wounds, that's why we're ruling this a homicide", Fitzgerald explained.
"Is it random or targeted?" I don't know that answer.
Authorities said they determined this by analyzing evidence at the scene and the 911 call that was placed early Monday morning, when James and Denise Closs were found dead and Jayme was reported missing.
"Grandpa Jim (James) Closs, your Momma Bear, Denise Closs and your very own night [in] shinning armor, your Daddyo Jim JR Closs ... love all of you!"
Investigators have received about 400 tip calls from across the nation.
"We all know that these things just don't happen here", Fitzgerald said, adding that there will be an extra presence of law enforcement officers in town. Meanwhile, deputies searched the area around the family's home with drones and infrared equipment and talked to Jayme's friends and middle school classmates, hoping to develop some leads.
"There comes a time in every community when help is needed; we have certainly experienced that need for help", said Wausau Police Chief Ben Bliven. Jayme Closs has seemingly vanished into thin air.
As Wisconsin authorities desperately search for missing 13-year-old Jayme Closs, they are now asking for volunteers to help look for more evidence.
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The father told detectives that when the child hadn't arrived in the afternoon, he assumed plans changed and left for the evening. Child Protective Services has since taken custody of the toddler and placed him in a foster home amid the ongoing investigation.
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The Barron County Sheriff's Department was dispatched to the home at 1 a.m. Monday after a 911 call was made from a cellphone.
The girl, who was immediately ruled out as a suspect and runaway, was missing by the time deputies arrived just four minutes later.
Authorities have described Jayme as a 5-foot-tall, 100-pound 13-year-old girl with strawberry-blonde hair and green eyes.
However, investigators with the Barron County Sheriff's Office say that the tip is not credible. The media are not invited.
"We have over 200 law enforcement workers on the ground right now".
Ed Downing Sr., who is married to the sister of one of Jayme's grandmothers, spoke to NBC News and said the family was in "disbelief" over the deaths and the teen's disappearance.
Police in Miami suggested on Tuesday she "may have been seen" at a gas station there on Monday, 1,700 miles (2,700km) away from her home. Closs, a missing teenage girl, could be in danger after two adults were found dead at a home in Barron, Wis., on October 15, 2018.