he had nothing to do with the death of rebecca zahau. were you present when rebecca died? no.ack her? no. josh mankiewicz: did you sexually assault her? no. did you tie those knots on her body? no. josh mankiewicz: are those the kind of knots that only a sailor or somebody who worked around boats in the water would know? no, those are common knots. josh mankiewicz: sheriff's investigators found no evidence adam was present when rebecca died, and they cleared him. that didn't stop rebecca's family from suing in civil court. the lawsuit, the long string of accusations-- what do you think is going on here? it's denial. it's-- they don't want it to be seen that their sister committed suicide. josh mankiewicz: we asked rebecca's sister, mary, about that. a lot of times, families do not want to admit that someone committed suicide, because they blame themselves for not, maybe, having seen the signs. is that what you're doing here? no. and i have been accused of that multiple times, including the sheriff's department. is it possible that rebecca was depressed and you missed it? no. j