Extended interview: '48 Hours' Peter Van Sant dives into the disappearance of Kelly Dwyer
Kris Zocco is serving 31 years behind bars for the murder of Dwyer. Zocco killed her at his east side apartment back in 2013.
Investigators say she was suffocated during sex. Her body was found 19 months later in Jefferson County.
Saturday night, Nov. 2, Zocco's mother explains why she believes her son is innocent.
Tune in to "48 Hours" on Nov. 2 at 9 p.m on CBS 58.