he had nothing to do with the death of rebecca zahau. were you present when rebecca died?> no. >> reporter: did you attack her? >> no. >> reporter: did you sexually assault her? >> no. >> reporter: did you tie those knots on her body? >> no. >> reporter: 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. >> reporter: 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's going on here? >> it's denial. it's -- they don't wanna be seen that their sister committed suicide. >> reporter: 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. >> reporter: is it possible th