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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 ...

>> reporter: after 26 years her father's alleged killer arrested, his capture thanks in large part to her. >> my family told me don't forget that name. >> reporter: she was just 9 when her father was murdered in 1986. jose martinez was shot and killed outside the new york city restaurant he and his wife owned. but the suspect, santos fled to the dominican republic. the nypd says the murder case was closed in 1988 after receiving information that santos was jailed in the dominican republic. what they didn't know was a year later santos was released. >> they should not have closed the case. it s...

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...

Santos fled to the dominican republic. the nypd says the murder case was closed in 1988 after receiving information that santos was jailed in the dominican republic. what the nypd didn't know, 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 background.com. what did you find? >> i didn't know i had so much stuff, i really didn't. >> reporter: after years of searching -- >> i'm like i think i have something. oh my god, but i had this person in the background check at t...