Police were originally called to the scene because someone thought a large dog was trapped in the sewer.
He becomes the fourth prison inmate to die from the virus.
Anthony Michael Legato was shot during an encounter on Interstate 35 with the Pine County Sheriff's Office.
The crash happened at approximately 8:39 a.m. Thursday.
Joseph Parise died shortly after helping with an inmate assault.
His cause of death is unknown and the prison is on lockdown.