Queens District Attorney Richard A. Brown announced the sentence Wednesday for 67-year-old Thomas Yarnavick.
Yarnavick pleaded guilty to manslaughter in May.
His roommate, 71-year-old Jailall Singh, was clubbed in the head with a wheelchair footrest on Oct. 30 in Rockaway Park.
Authorities say that after the beating, Yarnavick put the bloody footrest in a laundry hamper.