CHICAGO (CBS) — Prosecutors in Will County have released audio secretly recorded in jail – a tape they say features a whispering inmate trying to arrange the murder of his ex-wife.

Former attorney Robert Gold-Smith, 54, of Homer Glen, was convicted of trying to arrange the murder of his ex-wife in 2012.

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The evidence against him included secretly recorded audio from a wire worn by a fellow inmate at Will County Jail. Prosecutors said the recordings tied Gold-Smith to a murder-for-hire plot.

“You want me to kill her for $5000?” an inmate is heard saying on the tape.

“Just kill that f—— b—-. I’m telling you. F— that f—— b—-,” another voice said in hushed tones.

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“All right, I’m telling you, I got her. Slow down, man. Just listen. I got you, man,” the inmate wearing the wire said.

Gold-Smith tried to convince a judge it wasn’t his whispered voice.

“If the voice doesn’t fit, you must acquit,” he told the judge.

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But he was convicted and last month sentenced to 30 years.