[All items are believed to be in the public domain.]
[If not, please contact Black Dragon Keep and the offending item will be removed.]
The Bungled Heist
Answer
Eric committed the crime.
If we assume that Adrian was the culprit we can see that there would be 6 true statements, so it can't be Adrian.
We can repeat this will all five suspects and quickly see that only Eric being the culprit would result in exactly 5 statements being true.