A Missouri radio talk show host was arrested on murder charges Monday for allegedly poisoning his wife by spiking her Gatorade (search) with a chemical found in antifreeze.

James Keown (search), 31, was arrested at the radio station where he worked in Jefferson City, Mo. He later made a court appearance via video and said he would not fight efforts to return him to Massachusetts.

Prosecutors said he slowly poisoned Julie Keown, 31, with ethylene glycol while the couple were living in Massachusetts (search) in 2004.

District Attorney Martha Coakley said the motive may have been financial: Julie Keown had a $250,000 life insurance policy, but her husband was never able to collect because her death was under investigation.

The couple moved to Waltham, Mass., from Missouri in 2004. In May of that year, Julie Keown, a registered nurse, began suffering from nausea, vomiting and dizziness and developed a rash on her leg. She slipped into a coma in September and died.

A preliminary autopsy showed she was poisoned with ethylene glycol, but it took another year of testing before prosecutors had the proof to bring charges, Coakley said.

In the meantime, her husband moved back to Missouri, where he covered the Capitol for Jefferson City radio station KLIK (search) and hosted the "Party Line" talk show.

Keown had told fellow reporters that his wife had died, but he did not say how. He was known around the Capitol as a friendly and hardworking reporter.

Officials at the radio station referred questions about Keown to its corporate offices in Columbia, Mo. Messages left there were not immediately returned.

Shawna Keown, 21, said at her brother's hearing in Jefferson City that he was innocent. "The truth will come out," she said. "We hope for the best and I believe in him."