A 57-year-old Denver man has been arrested for allegedly using an Army surgical kit to remove the testicles of a transgender woman.

James Lowell Pennington, who is not a licensed medical professional in Colorado, was arrested Thursday on suspicion of reckless aggravated assault causing serious bodily injury, according to an arrest warrant affidavit.

The procedure took about 90 minutes and was performed Wednesday at the victim’s Denver apartment. The surgical kit included a scalpel, lidocaine, medical dressing and other medical items.

“The suspect had previously agreed to conduct” the medical procedure on the transgender woman, the affidavit said.

The incident and arrest was first reported by KUSA-TV Friday.

After removing both testicles, Pennington sutured the incision and advised the victim to call 911 if any “complications” developed, the affidavit said. The wife of the victim was present during the procedure and witnessed it.

While changing the dressing “a large amount of blood poured out of the incision” and 911 was called, the affidavit said.

Paramedics responding to the call, at about 2 p.m. Wednesday called police.

The testicles could not be reattached because of the amount of time that passed between the procedure and the victim’s call for help. The victim suffered serious bodily injury and “risk of permanent disfigurement,” the affidavit said.

Pennington was contacted by phone on Thursday and advised to respond to investigators. After being read his Miranda rights and admitting to “completing this surgical procedure” he was arrested.