A prison inmate has admitted to fracturing another inmate’s skull with a metal pipe, leaving the man in a “semi-vegetative state” for several months.

The Kansas City Star reports 49-year-old Jimmy Eastep Jr., pleaded guilty Monday to assault with a dangerous weapon.

According to his plea agreement, Eastep assaulted 52-year-old Michael Seaman at the federal penitentiary in Leavenworth in January 2016 after Seaman called him a name.

Investigators found a 20-inch metal pipe with blood next to Seaman.  Eastep was linked to the assault by DNA testing.

Investigators say Seaman was not able to communicate with them for almost a year.

The plea agreement calls for Eastep to be sentenced to another 3.5 years in prison.