The suspect will be interviewed by Lund police today.
His 69-year old mother was planning to hold a 70th birthday party today, when she was cut so badly with a knife that she later died. The police who arrived on the scene arrested to 40-year old son near the terraced house where the woman was injured.
Police say that other family members were also present for the party preparations. Several witnesses have been interviewed, and forensic scientists have examined the area.