The father of a man considered a person of interest in his ex-girlfriend's 2007 disappearance and now charged with burning another missing Missouri woman's car says he's heartbroken by his son's "crappy decisions" and violence toward women.

Ken Yust told The Associated Press on Tuesday that he hasn't had a relationship with 27-year-old Kylr Yust for years, because they often disagreed on matters. He says he "feels for the families" of those hurt by his son.

Kylr Yust was arrested Sunday after Jessica Runions' car was found burned and abandoned in Kansas City. The 21-year-old Runions was last seen Thursday. In Belton, police say Yust is a person of interest in the 2007 disappearance of teenager Kara Kopetsky, who vanished days after seeking a protection order against him.

Yust isn't charged in either disappearance.

Records show that Yust's pregnant then-girlfriend won a protection order against him in 2011 after accusing him of drunkenly choking her. He pleaded guilty and served 120 days in jail.

Benton County Sheriff's Department