>> the blood evidence is the biggest thorn in my side. that causes me the greatest problems. so i struggle with the blood evidence. >> reporter: three years later, the goldman and brown families sued simpson in a separate civil trial, o.j. found liable and ordered to pay $33.5 million to their families. >> in the civil case, they actually uncovered additional evidence beyond the enormous evidence they already had against o.j. simpson. so if you take the two verdicts together, yeah, he didn't serve time, but he was found responsible for the killings. >> o.j. simpson is under arrest in las vegas -- >> in connection with an alleged armed robbery -- >> reporter: simpson found trouble again in 2007, arrested for robbery and kidnapping at a low-end las vegas casino. simpson claimed he'd received a tip that some missing personal memorabilia had surfaced in the hands of a sports memorabilia dealer. his dramatic attempt to retrieve it documented on an audio recording played during his trial. >> [ bleep ] you think you can steal [ bleep ] -- >> reporter: his defense attorney saying the