Police have detained a man suspected of murdering Ashley Olsen, a 35-year-old American woman, in Florence last week. The detained man is Cheik Diaw, a 27-year-old undocumented Senegalese migrant known to the police for drugs-related issues. He has admitted being responsible for her death, but said he did not intend to kill her, sources said. Prosecutors said the man was held on the basis of DNA evidence taken at the crime scene. ... Diaw said he had sexual relations with Olsen after meeting her in a club and going to her home, according to the sources. He said they subsequently...