A man arrested on suspicion of burning a missing Raymore woman's car is now in custody of Kansas City police and a search was underway Wednesday at his grandfather's Raytown home.

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A man arrested on suspicion of burning a missing Raymore woman's car is now in custody of Kansas City police and officers have searched his grandfather's Raytown home.Kylr Yust, 28, was arrested without incident Sunday in Benton County. He's accused of burning Jessica Runions' vehicle. Her burned car was found in an area near 95th Street and Blue River Road in south Kansas City over the weekend.Authorities said Yust was the last known person to be with Jessica Runions, who was last seen at a party Thursday night in Grandview. Yust is also the former boyfriend of missing Belton teenager Kara Kopetsky, who vanished in 2007 while trying to sever ties with him.Investigators spent much of the afternoon serving a search warrant at the Raytown home of Yust's grandfather. It's the home where Yust lived after getting out of prison in February.Alfred Yust said police took alcohol swabs, Q-tips and a blue plaid shirt from the home.He said that while he's concerned about the two missing women and wants to believe his grandson had nothing to do with their disappearances, he just doesn't know.Kylr Yust was brought back to Kansas City Wednesday, fingerprinted at the South Patrol precinct and taken to the Jackson County Jail. His bail was set at $50,000.A former girlfriend of Kylr Yust's said she has stayed friends with him off and on over the years. She told KMBC 9 News that he texted her Friday morning and wanted to hang out, but she told him she was busy."He kind of got angry with me," said the woman. "He was like, 'Well, whatever, I see how much you care about me,' and didn't talk to me until later on that night. The last text I actually got from him was at 7:55 p.m. on Friday."She said in the text, he told her he was planning to do some birthday things. His 28th birthday is Wednesday.The woman said she feels lucky that she had other plans and didn't go."I always hang out with him," she said. "I felt like if I would have gone with him on Friday, I wouldn't be home today."She said his moods can shift quickly."He's like a light switch," she said. "He could be nice one minute to somebody and then he'd flip that switch and he's like the devil himself."Anyone with information about the disappearance of Jessica Runions is asked to call the Crime Stoppers TIPS Hotline at 816-474-8477.11833402