A Chicago woman, looking for antiques, walked into a Dresden Ave. furniture store late in July 1973, and came upon two badly beaten bodies and a severely injured child.She had stumbled upon one of the city's worst murder cases -- a horrendous crime which remains unsolved today.Dead were Earl A. Tweed, 75, store owner, and Mrs. Arthur (Linda) Morris, 22, who was four months pregnant. Her daughter, Angela Lynn, 4, was battered and unconscious, dying shortly afterward.Tweed of 3rd St. had operated the National Furniture and Upholstery Repair Co. since 1912 when he came to the city from Steubenville. Police surmised Mrs. Morris went into the shop and came upon a robbery in progress.Mrs. Frances Dugan of Chicago, a nurse, walked into the store just before 1 p.m. July 30 -- a Monday -- planning to inquire about antiques. Discovering the bloody scene, she ran outside and shouted to someone across the street, "Call the police! Something terrible has happened!"A telephone call was received at police headquarters within minutes. Since Tweed was lying several feet away from the woman and her daughter, he was not seen immediately by first arrivals, so the phone call reported only two victims.