A Suburban Hospital employee who was once before accused of killing a co-worker has been charged with slaying the hospital supervisor who recently gave him a poor performance review by stabbing him more than 70 times. Montgomery County police chief Thomas Manger said Thursday that 49-year-old Keith D. Little, of Lanham, was charged with first-degree murder in the Jan. 1 killing of Roosevelt Brockington Jr. in the Bethesda hospital’s basement boiler room.

Brockington, 40, was the hospital’s lead engineer and Little’s direct supervisor. Brockington had recently reprimanded Little several times and denied him a raise in a performance review, according to police officials and court documents.