The woman was taken into custody in Växjö on Sunday afternoon.
“We are trying to ascertain what has happened and the motive behind both crimes and the connections between them,” Robert Löffel, head of information at the Kronoberg police, told TT news agency.
A man in his seventies was found seriously injured in a stairwell in a residence in central Växjö. The man had been slashed on the chest with a sharp instrument and was transported to the central hospital in Växjö, where he later passed away.
Police also received a call to an apartment in the northern part of Växjö where a 40-year-old male relative to the elderly man was found dead. The police have launched a preliminary murder investigation. Authorities do not want to reveal how the men were killed.
The murder scenes are located far apart. A tip led to the arrest of the woman and after an interview she was held on suspicions of murder.
The woman has no previous criminal record, according to Löffel. “We have no comment on what she said during the interview,” he said.