Luis M. Avila-Zarate, 27, of 2081 Stonelake Rd., Apt. 116, was arrested about 2:45 p.m. Saturday and charged with aggravated assault after he allegedly threatened an acquaintance on the 2000 block of Stonelake, police said. The suspect was taken to McHenry County Jail and given a Tuesday court date, according to authorities.