It was in mid-September last year that a 21-year-old man was shot to death at a bus stop near Långbergsskolan in Brandkärr in Nyköping.
In early October, a 23-year-old man was arrested in his absence on probable cause on suspicion of murder, two counts of attempted murder and aggravated weapon crime.
A few weeks later, he was arrested by the police in the Stockholm area.
Shortly afterwards, a 24-year-old woman was arrested on suspicion of grossly protecting a criminal.
On Thursday, the 23-year-old was charged with murder, attempted murder and a felony.
The 24-year-old woman and another man are charged with suspicion of protecting a criminal, felony.
All suspects deny any wrongdoing.