A suicidal heroin addict raped a woman as he held a gun to her head last month, according to a criminal complaint filed Wednesday in Walworth County Court.

Richard D. Oberst, 33, Madison, is charged with two counts of first-degree sexual assault, false imprisonment with use of a dangerous weapon, possession of a firearm by a felon and two counts of operating a vehicle without owner consent.

Police on April 8 spoke with the woman, who described to police an incident in late March, when Oberst said, “My life is over,” prompting the woman to record the rest of their conversation, according to the complaint.

About 17 minutes into the recording, the woman can be heard screaming for Oberst to stop taking off her clothes, the complaint states. During their interview with the woman, police stopped playing the recording because the woman became so upset.

The woman told police Oberst had rope, tape, a sock and a handgun. He tried to put the sock into her mouth, and he held her down and ripped off her clothes, according to the complaint.

Oberst had sex with the woman without her consent, the complaint states. A charge of first-degree sexual assault can be charged when the prosecution believes there was sexual intercourse without consent “by use or threat of use of a dangerous weapon.”

The recording captures Oberst telling the woman to “shut the (expletive) up” and saying he wasn’t going to “kill” her, according to the complaint. The woman in the recording tells Oberst how afraid she is and asks him to turn the gun away from her.

After the assault, the woman said, Oberst took her car and went to buy heroin, according to the complaint. The woman took and hid six or seven bullets from the silver revolver, according to the complaint.

Prosecutors added a lifetime supervision modifier to each of the sexual assault charges.

“Because this charge is a serious sex offense,” the complaint reads, “upon conviction, the state will seek to place the defendant on lifetime supervision.”

A conviction on just one of the sexual assault charges would yield a maximum prison sentence of 60 years.

The woman on April 8 told police she had loaned her car to Oberst, according to the complaint. When he didn't return the car, Oberst told her over the phone in a slow and groggy voice that he had gone to get heroin.

Judge David Reddy on Monday ordered a $50,000 cash bond for Oberst, according to online court records. Oberst refused to sign the bond, which forbids him from contacting the woman or possessing drugs or a firearm.

Oberst is set to make his initial court appearance at 1:15 p.m. Friday.

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