(AP) – A Kansas man pleaded guilty to second-degree murder and other crimes in the death of his girlfriend’s 19-month-old son.

Chad Carr entered the plea Thursday under an agreement that reduced the charge from first-degree murder.

The 28-year-old Carr was charged in the March 2010 death of Vincent Hill. Carr was the boyfriend of the boy’s mother.

The Wichita Eagle reports that authorities said the boy suffered blunt-force injuries and most likely died by suffocation.

Carr also pleaded guilty to three counts of aggravated battery and one count of child abuse. The sentences for each count will run consecutively.

The boy’s mother, Katheryn Nycole Dale, is serving a three–year sentence after pleading no contest in July to child abuse and aggravated child endangerment in her son’s death.