homicide unit. >> so i ended up putting in for that job and being selected. >> reporter: it wasn't long before he cracked open the doors that housed the homicide files. >> and i open the cabinet and i see the torrez case. and i remembered the incident with debbie from about a year earlier. so i pulled it out and i started reading just on free time, just reading it a little bit. >> reporter: by then, the cathy torrez case had been cold for a good three years. >> and essentially no work had been done on it for at least the last two years. >> reporter: from the beginning, police had suspected cathy's one-time boyfriend sam lopez had something to do with her murder. but they had nothing connecting him to the crime. no witnesses. no dna. and sam had that solid alibi. tina was still married to sam's brother, armando. the two families intertwined, as cathy's family continued to search for answers. >> and then in april of 1997, i