In 2010, Lana Wood told CNN she believed an argument between her sister and Wagner on the yacht's back deck preceded Wood's drowning.

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"My sister was not a swimmer and did not know how to swim, and she would never go to another boat or to shore dressed in a nightgown and socks, " said Lana Wood, referring to theories that the actress may have voluntarily jumped from the boat, last year.

CNN: January 15, 2013 -- Updated 1645 GMT (0045 HKT)