justin's computer went to chris hendry of florida's computer evidence recovery section. >> when i made a copy of justin's home computer hard drive the next thing i did was go through and look for anything that would have been deleted such as folders and files. >> one of the first things hendry noticed was that justin downloaded a song onto his computer just hours before his wife's death. >> the lyrics are violent. they're about killing somebody. >> it was a song by the group "guns and roses" with the lyrics i used to love her but i had to kill her. she drove me nuts and now i'm happier this way. >> it is kind of strange this is deleted hours before we actually got the machines. >> was this merely a coincidence? after all, it was only a song. >>> justin barber told police that a robber shot his wife, april, in the head and shot him four times while they were walking on the beach. he claimed he passed out, later regained consciousness and found his wife face down in the ocean. >> i saw her in the water. >> but the forensic evidence contradicted parts of justin's story. >> she had evidenc