The bodies of 84-year-old Ross Woodward and 81-year-old Rhoda Woodward were discovered by a postal worker on Tuesday morning.
The Montgomery County district attorney's office said on Wednesday a determination about the cause and manner of death are pending toxicology results.
No further details were released.
The discovery was made in the 500 block of S. Bethlehem Pike around 11:30 a.m. Tuesday.
A short time later SWAT officers surrounded the home, and a team carrying shields entered through the front door.
Evidence markers were placed on and around the property, with a particular focus on the garage.
A large sign posted in front of the house read "Happy Transmission." A neighbor said the sign was in reference to a long-running feud the couple was having with an electrical transmission site across the street, a site they feared was transmitting some kind of electrical waves.
Investigators have said the Woodwards' deaths are suspicious, but they were not being investigated as homicides for now.
Send a News Tip to Action News
Learn More About 6abc Apps