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Information as to whether or not he was out of jail. >> reporter: in 2006 she started hunting online for her father's alleged ki8 killer delving into websites like background.com. what did you find? >> i didn't know i found so much stuff. >> reporter: after years of searching -- >> let me look. i had this background check. it was right at the top. >> reporter: she took what she found here to the 34th precinct in november. >> because november is the anniversary of my father's death, and i get upset. >> reporter: police say it is because of her efforts they were able to capture santos. >> it is ...

See if there was additional information. >> reporter: in 2006 she started hunting online for her father's killer going into websites like background.com. >> what did you find? >> i didn't know i had so much stuff. >> reporter: after years of searching. >> i'm like i think i have something. i said, oh, my god. i had this person in the background check. >> reporter: she took what she found here to the 34th precinct in november. >> november is my father's anniversary and i get upset. >> reporter: police say it was only because of her efforts they were able to capture her. >> obviously she made a ...

Just a year later, santos was released >> they should not have closed the case. >> reporter: in 2006, jocelyn started hunting online for her father's alleged killer delving into websites like background.com. >> reporter: what did you find? >> i didn't know i had so much stuff. i really didn't. >> reporter: but after years of searching -- >> let me look. oh, my god, i have this person at the background check right at the top. >> reporter: she took what she found here to the 34th precinct in november. >> because november's the anniversary of my father's death and i get upset. >> reporter: police...

Websites like background.com. >> what did you find? >> i didn't know i found so much stuff. >> reporter: after years of searching -- >> let me look. i had this background check. >> reporter: she took what she found here to the 34th precinct in november. >> november is the anniversary of my father's death and i get upset. >> reporter: police say it is because of her efforts they were able to capture santos. >> it is admirable what she did. she made an effort and it paid off. >> reporter: a police source tells cnn after santos was arrested in miami thursday he confessed to murdering jose martine...

Republic. what the nypd didn't know was that just a year later, santos was released. >> they should not have closed the case. it should have been looked at to see if there was additional information as to whether or not he was out of jail. >> in 2006, joslyn started hunting online for her father's alleged killer. delving into websites like background.com. >> ha did you find? >> i didn't know i had so much stuff. i really didn't. >> but after years of searching -- >> i was like, i think i have something. let me look. oh, my god. but i had this person in the background check right at the top. >>...