in the world. he wouldn't hurt a flea. if you'd interview them, they'd say he was a great neighbor, kept to himself, never bothered anybody. >> but persitz and michael were more than just friends. michael was persitz's financial adviser. their relationship was rocky at best. investigators discovered persitz gave michael $150,000 to invest but there were more losses than profits. at some point, persitz discovered his stock portfolio was worth less than $30,000. >> for the most part, they weren't investments that were suitable for a guy that invested every nickel he had with michael. >> when questioned by police, persitz denied any involvement in michael's murder and he willingly took a lie detector test arranged by his lawyer. >> i called a polygrapher and had zachary tell them that he hadn't done it and he passed.