 This case is also acknowledged as one of the most labor-intensive missing person and murder investigations in Cook County, and remains one of Chicago's most infamous cold cases.On December 28, 1956, two of the seven children born to Joseph and Lorretta Grimes—sisters Barbara, 15, and Patricia, 12—opted to view a screening of the Elvis Presley film "Love Me Tender" at a Brighton Park theater.Both girls have been described as being inseparable sisters, and attentive students at the Thomas Kelly and St. Maurice high schools they respectively attended.