Left inset: Kobe Aust (Boone County Sheriff's Office). Right inset: Ryan Burke (Facebook). Background: Michael Ryan Burke's home in Missouri where he was shot and killed during an alleged Facebook Marketplace "ruse" to steal his iPhone (KRCG).
A Missouri teenager accused of killing a decorated U.S. Marine inside the man's own home — after setting him up in a Facebook Marketplace scam with two other teens — allegedly threatened to kill a person just weeks earlier, telling the individual in texts and phone calls that he "would shoot up his house," according to court documents.
Kobe Aust, 18, is already charged with second-degree murder, first-degree robbery and armed criminal action in connection with the shooting death of Ryan Burke, 42, on Jan. 18 at his house in Columbia, Missouri. Now he faces a first-degree harassment charge for the alleged phone threats he made toward another individual living in the area.
A probable cause affidavit filed by police in Boone County describes how Aust, who is accused of killing Burke with 18-year-old defendants Joseph Crane, Alexis Baumann and a juvenile suspect, told the harassment victim that he would "crunch" him on Dec. 14, 2025. The victim told police that "crunch/crunching meant Aust would kill [him]," according to the affidavit.
Investigators were shown messages in which Aust was allegedly telling the victim he would "beat" him up and that the individual would get his "a—" handed to him by Aust if they were to ever fight. The victim told police they "believed Aust was in possession of a firearm," according to the affidavit.
"There has been video of him showing the firearm and recording himself with the weapon posted online," the affidavit says, citing statements made by the victim. "[Police] observed a video recording, posted to Aust's personal Facebook page, holding and showing a firearm with extended magazine," the document adds.
The victim allegedly said that he "had been hiding in the basement" after receiving the threats out of fear of what Aust would do to him. He told police that he believed Aust would "shoot and kill" him, according to the affidavit.
"Aust knows where [the victim] resides and where [the victim] works," the affidavit notes.
Aust, who is being held without bond for Burke's murder, was informed Monday about the felony harassment charge and is scheduled to appear for a preliminary hearing on March 26.
For the murder case, cops say Aust and the others went to Burke's home "under the ruse" of them wanting to buy his iPhone 15 Pro, which is valued at about $585, according to court documents.
"I'm here," the juvenile suspect allegedly texted Burke after arriving with the group.
The teens arrived at Burke's house around 8:10 p.m. after coordinating the meeting on Facebook, according to police. Baumann allegedly confessed during police interviews to riding with the teens to Burke's home in her vehicle, with Crane and the juvenile suspect going inside to retrieve the iPhone while Baumann waited outside with Aust.
"Alexis advised she heard three gunshots from inside," the court documents say. "Juvenile suspect #1 and [Crane] ran back out to her vehicle, and she drove away from the scene."
Baumann allegedly told police that Crane and the juvenile "were both armed with pistols, and once back inside of her car" they admitted to shooting Burke and stealing his phone, "which they sold at the ecoATM at the Conley Rd. Walmart directly after the murder," per the court docs.
"Hey, I'm dying and I love you," Burke texted his mom and sister after being shot, according to family friend and fraternity brother Jerry Reifeiss, who spoke to local CBS affiliate KRCG about Burke's death.
"He texted them saying that," Reifeiss recounted. "That was just Ryan. He always put people in front of him and wanted to make sure people knew how he felt. He didn't want to go on to the next life and pass away without providing some information to us here that would bring justice to these people and let people know he always loves them."
Police say Burke, who reportedly did missionary work in Uganda, also managed to call police after being shot and "reported someone came to buy a phone from him, and the suspect shot him."
While fleeing, Baumann alleged that Crane and the juvenile "threw their sweatshirts out of her car window," which Aust corroborated in police interviews as well, according to police. He, too, allegedly said Crane and the juvenile were armed and went inside Burke's home.
The group is accused of going on a robbery spree before killing Burke, during which they targeted at least two others for their phones.
"If you touch me I'll shoot you," the juvenile suspect told one of the victims after swiping her phone "when she showed it to him," police say.
Surveillance footage obtained by police shows the teens allegedly selling the phones they stole at the same Walmart on Conley Rd. following all three robberies. Detectives were able to track down the group on Monday using Flock license plate cameras to locate Baumann's car. She and Aust were taken into custody and interviewed about what happened, with Crane and the juvenile being arrested later in the day.
All four individuals are being held without bond.
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