that don't look quite right. >> and later, during ken fitsue's interrogation, ken referred to his sonn an odd way. >> her oldest son graduates from college in a couple of weeks. she wanted to be there for that, too. it's really a sad time. >> you said her other son. is he not your son? >> no, he's our son. >> further investigation helped explain this slip. shortly after ken and christine were married in 1966, ken became friends with a co-worker named bob brown. they both worked at the san diego aerospace contractor back in the late 1960s. >> ended up, the three of them hanging out together all the time. >> as a result, bob brown's relationship with christine soon went beyond friendship. >> as bob put it, he thought christine was starved for affection. they have this affair that goes on for many years. when christine got pregnant and gave birth to her oldest son justin, sources told police that ken was not the boy's biological father, it was bob brown. >> robert maintained his friendship. as a matter of fact, he was justin's godfather. >> to confirm justin's paternity, investigators tr