URBANA, Md. - An apparently homeless Virginia man who allegedly fatally stabbed a South Korean missionary and seriously wounded the missionary's wife at a Maryland church retreat center was charged with murder Monday. Song Su Kim, 30, of Falls Church, Virginia, was charged in Frederick County, Maryland, with first- and second-degree murder, first- and second-degree attempted murder and two counts of assault. Deputies responded Sunday night to a 911 call reporting the stabbing at the Anna Prayer Mountain Church Retreat Center, a Christian complex set amid wooded hills near the rural community of Urbana, about 40 miles northwest of Washington, D.C., said Sheriff Chuck Jenkins. Charging documents identified the victims as Chung Hwan Park, 63, and his wife Ae Suk Ko, 58.