The Hartford man accused of killing a state trooper in a hit-and-run crash last year pleaded guilty Tuesday to first-degree manslaughter.

He accepted a plea agreement that will have him serve 18 years in prison.

Investigators say on May 30, 2024, Alex Oyola-Sanchez, 44, sideswiped State Trooper First Class Aaron Pelletier’s cruiser on I-84 east in Southington. The trooper was standing outside his vehicle conducting a traffic stop at the time of the crash.

Officials say Oyola-Sanchez drove off, but broke down five miles away. They say he admitted taking fentanyl before the crash.

He faces several charges including operating under the influence of drugs or alcohol.

Oyola-Sanchez will be sentenced on April 29.