A relative found the bodies inside the 3300 block of Mary Street around 4:30 p.m. Thursday.
The bodies were later identified as 65-year-old Henry McCabe Jr. and 63-year-old Kathleen Verdecchio.
Police say Verdecchio shot her brother than turned the gun on herself. Both were pronounced dead at the scene.
Upper Darby police say both had serious health problems.
