Police decided to question Hans Kristian Rausing after investigators said they found information on the unsolved killing of Palme on the computer of Eva Rausing, the Hans Rausing's deceased wife, The Local.se reported Thursday.
Eva Rausing died of a drug overdose in May but her husband allegedly hid her body under a pile of clothes in a sealed room for 57 days.
When her death was discovered British police searched the deceased's computer they allegedly found information regarding Palme, who was shot by an unidentified assailant in Stockholm in February 1986.
Police haven't said what the exactly the information found on the computer is about.
The daily Expressen said Hans Rausing will be questioned at a rehab clinic in London where he is being treated for drug abuse.