A supporter of Italian football club SSC Napoli has been arrested in connection with the death of another fan in Milan in December 2018, police said on Friday.
The 39-year-old Naples ultra is accused of having driven the car that ran over an Inter Milan supporter.
The 35-year-old later died in hospital.
The incident happened during clashes between supporters of the two Serie A clubs around Christmas in 2018.
Ultras fans are especially fanatical in support of their club.
Police accused the Napoli fan of incidental homicide.