WOODSTOCK – Prosecutors say they want to force Kimberly A. Smith to testify at her husband’s upcoming murder trial and won’t use what she says against her in her own criminal case.

The couple are accused of placing an online ad for sex, which police say was answered on May 28, 2011, by Kurt Milliman. A dispute broke out, possibly over money, and Milliman was shot. He died early the next morning.

Prosecutors are asking McHenry County Judge Sharon Prather to grant “use immunity” for Kimberly Smith and force her to testify against her husband, Timothy S. Smith.