Italian prosecutors have laid out evidence collected against a key suspect in the death of an American woman who was strangled and suffered deadly head trauma in her Florence apartment.
They said on Thursday that a Senegalese man she met at a disco had left "decisive" DNA traces on a condom and cigarette butt at her home and he was using her mobile phone.
Cheik Tidiane Diaw, a 27-year-old who had arrived in Italy from Senegal in recent months, admitted under questioning that he and Ashley Olsen, 35, had fought violently after a night of drugs and sex but denied strangling her and said he never intended to kill her, his lawyer revealed.
Diaw was arrested early on Thursday at his brother's apartment and is being held on suspicion of aggravated homicide, Florence chief prosecutor Giuseppe Creazzo told a news conference.
Street-mounted security cameras and witnesses reported that Diaw and Olsen had left Florence's Montecarla nightclub in the early hours of January 8 and went to her home.
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Once there, they had consensual sex.
But sometime afterward, Olsen's skull was fractured in two places with blows so violent they alone could have killed her, Creazzo said.
She was subsequently strangled, apparently with a cord or rope.
Olsen's naked body was discovered the following day by her Italian boyfriend, who asked the apartment's owner to let him in because he hadn't heard from her in a few days, authorities have said.
Diaw acknowledged under questioning that he and Olsen had consensual sex, were drunk and had been high on cocaine, his lawyer Antonio Voce told AP news agency.
But Diaw denied strangling her, left her alive on her bed and never intended to kill her, Voce said.
Voce said Diaw told investigators that they had fought when she tried to push him out of the apartment fearing her boyfriend would be arriving.
After being pushed against the door, Diaw responded by punching Olsen in the neck and then pushing her to the ground, where she hit her head, Voce said.
Diaw helped her to the bed and left.
Creazzo said Diaw had offered "substantially admissive" testimony in response to the accusations during a preliminary interrogation that lasted until 4am on Thursday.
Diaw has not been charged.
But Police detained Diaw after DNA analysis came back from a used condom and cigarette butt found in Olsen's toilet, as well as biological samples taken from under her fingernails that belonged to Diaw, Creazzo said.
Investigators matched that evidence with a DNA sample taken from a cigarette Diaw smoked while being questioned at the police station, prosecutors said. They said the tests were conducted in "record time".
Diaw had also taken Olsen's mobile phone, put his own SIM card in it and used it, Creazzo said.
"We have gathered serious indications of guilt against him," Creazzo said, adding however, that a judge must confirm the arrest.
