james van horn hangs out at pulse often.e says mateen was a regular over the last few years but not to survey it. >> it's not like he just sat and staired at people. he was an active person who tried to find somebody, maybe to go to bed at night. >> reporter: his interest in gay men may have gone back at least 10 years at former law enforcement training course who didn't want his face shown. >> because i wasn't out at the time, i told him no, i'm not. and he said if you were gay, you would definitely be my type of guy. >> reporter: while law enforcement seeks to understand his motive, the family of cory seeks to find their own answers. >> if you need anything, he would drop anything and give you anything you needed. >> he's the kind of guy who would take a bullet. >> he would take a bullet for anybody. >> reporter: cory was at pulse with his girlfriend and their football team, celebrating the final game of the season. >> he was behind her when they were leaving and when the guy came in, he shot paula first and she grabbed my

james van horn said he saw the killer there many times. >> it's not like he just sat there and stared people. he was an active person that tried to, you know, find somebody maybe to go to bed with that night. >> witnesses told fbi agents that mateen posted pictures of himself on gay dating apps and what appears to be life of mateen is a central focus of the fbi investigation into the motive behind the terror attack. he also saw mateen at pulse said he talked about having a wife and a child. >> i know the struggle of him with his wife and stuff and his family didn't know that he was gay but he's been doing this, coming to these clubs for years and years and years. >> his ex-wife told abc news that he told her that he often frequently night clubs without saying they were gay clubs. >> do i think he was gay? >> she struggled with my question? >> i at this point, i think he might have been. maybe he one able to be honest about it at all to anybody because of the family and the culture he is from. >> his interest in gay men goes back at least ten years according to a former classmate in a

. >> james van horn says mateen would visit for a few weeks at a time on weekends and then he wouldn't be seen for awhile. van horn claims mateen was coming to the club for two years. >> my friends came out and said, oh, come on in the back we'll take pictur they said we don't like you talking to him. this has been like six months ago. and i said, why not. they said, well, we don't like him. he's weird. he's weird. he would try to meet people and try to bump up against people and put his arm around and maybe try to dance with them or something because that's what everybody tries to do. it's not like he just sat there and stared at people. he was an active person that tried to, you know, to find somebody maybe to go to bed with at night. >> van horn also said that he recalls talking to mateen about his divorce from his wife. also there was a report from our houston station that quotes a man saying he was contacted by mateen on a dating app. >> as we mentioned all of the victims killed in the massacre have now been identified. one young woman who lost her life left behind more than she c

james van horn says he saw the killer there many times. >> it's not like he just sat there and stared at people. he was an active person that tried to, you know, to find somebody, maybe to go to bed with that night. >> reporter: witnesses have told fbi agents that mateen posted pictures of himself on gay dating apps. and what appears to be the secret life of mateen is now a central focus of the fbi's investigation into the motive behind the terror attack. cord cedeno, who also saw mateen at pulse, says he talked about having a wife and a child. >> i know the struggle of him that his wife and stuff, and his family, didn't know that he was gay, but he's been doing this, coming to these clubs for years and years and years. >> reporter: today, mateen's ex-wife, sitora, told abc news that he told her he often frequented nightclubs without saying they were gay clubs. >> do i think he was gay? >> reporter: she struggled with my question. >> i -- at this point, i think he might have been. maybe wasn't able to be honest about it at all to anybody, because of the family and the culture that he'