it's the first time we have seen scott petersen behind bars outside of his multiple mugshots after hisest in 2003. it's been 20 years since his wife, lacey who was eight months pregnant, vanished from their modesto home on christmas eve. petersen was found guilty of the murders and received the death penalty which was overturned in 2020. now, he's in prison without the possibility of parole. on april 19th, he filed a new petition in a california appellate court seeking his release. the 800-page document lays out six claims, some involving what petersen and his family members are calling new evidence about a burglary across the street from the petersen's home around the time lacey vanished which they believe will exonerate him. >> this is all evidence that the madina burglary occurred the day lacey went missing. >> reporter: his sister-in-law janemy petersen told me in february they still believe he's innocent. >> no one has ever given a scenario that fits the evidence and explains how scott could have committed this crime. >> reporter: i asked the retired detective who worked the case