Patrick Frazee was found guilty of the death of his fiancée Kelsey Berreth, who was last seen with her daughter Thanksgiving near her home in Colorado.
The jury consists of six men and six women less than four hours before the verdict.
The 33-year-old Frazee was found guilty on all charges: two murders, three homicides to commit murder, and manipulation of a deceased human body. He had refused to kill Berreth, 29, and did not plead guilty. The trial began on 1 November.
In concluding arguments, the prosecutors argued that Frazee had planned Berreth's death for months, while the defense called evidence presented during the trial "cumbersome" and "invented."
Berreth was the last to be seen on Thanksgiving. The surveillance video shows her shopping with Kaylee, the couple's 1
Frazee, who does not live with Berreth, has told him last time that day and last heard about her on November 25, but was not reported missing by her mother on December 2.
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Berreth's body was not found. Her parents have custody of Kaylee.
But Krystal Lee, Frazee's former girlfriend, previously named Kenney, said during the trial that Frazee had instructed them on Thanksgiving to eliminate chaos in Berreth's apartment. When Lee, a nurse from Idaho, arrived on November 24, she found blood on the floor of the living room splashed on the walls, on the carpet in other rooms, and behind a couch.
She said she was cleaning up the mess, but leaving small patches that the investigators could find.
Frazee later told her that he had beaten Berreth to death with a baseball bat and then burned her body on his ranch, she said. "He just said that he swung away and that it's really hard," Lee said, adding that Frazee told her that Berreth had asked him, "Please, stop it."
The prosecution said Kaylee was in the apartment while her father killed her mother
Lee said she was instructed by Frazee to bring Berreth's cell phone to Idaho so it looked like she had left. She obeyed and burned the phone. According to the investigators, it was last on November 25 near Gooding, Idaho, a ping signal.
Lee was charged with manipulating evidence and pleaded guilty in February, agreeing to testify against Frazee in a plea. The prosecution said before Frazee had killed Berreth, he had three times tried to persuade Lee to commit the crime.
An inmate testified during the trial when he and Frazee were in the same prison, Frazee asked him to kill Lee. Between the two records, there are more than 10 other people who had to "disappear or be invisible" until a law enforcement officer testified on Friday.
A friend of Frazee, Joe Moore, said the two were together in April 2018 when he asked Frazee what Berreth was saying, "I found a way to kill her," Moore replied. During the conversation, Frazee grinned and said, "No corpse, no crime, right?" Moore said.
After Berreth disappeared, they met again on December 20, and Frazee was surprised at the media's interest in the case. Frazee was arrested the next day and charged with murder.