A 37-year-old inmate accused of attempted second degree, aggravated battery of a law enforcement officer and trafficking contraband in a penal institution has been sentenced to more than 21 years in prison more than guaranteeing he’ll spend the rest of his life behind bars. Dejaun Wilkerson was already serving a hard-50 life sentence for first degree murder.

Wilkerson was convicted of attacking William Kendall, a former sergeant at the Hutchinson Correctional Facility Central Unit back on July 6, 2010. Kendall suffered severe injuries when Wilkerson beat him with his hands and feet. The officer had to retire from his position because of those injuries. That included a busted jaw, broken nose and bumps on his head and shoulder and a laceration to the back of the head. One of the bumps to the head was behind his ear and has effected his hearing.