Tomah police are still trying to determine how a man and woman died in their home.
Police say autopsies Tuesday found no signs of blunt trauma, gunshots or sharp instruments that could have caused the deaths.
Toxicology results are not expected for several weeks.
Police identified the victims as 35-year-old Michael Bobak and 25-year-old Tracey Small. Officers found their bodies in the house Monday after a man reported two unresponsive people.
Bobak and Small lived in the house, along with two children. Police said the children are in good condition.
A neighbor told the La Crosse Tribune that Bobak and Small recently moved into the house. Police said there is no threat to the public.