His profile is present, on both Rita and Colleen. 

The prosecution back then went with the #JunkScience theory that #SpermDensity and #Gravity proved that Bittrolff was present when they were murdered.

What is now rather important is that the DNA present on Colleen and the jeans which contained her blood, are the same "unknown" contributor. Considering the violent manner her her death, the blood and DNA clearly implies that that male profile was present at the time of her murder.