Lana Wood is telling a chilling story about the night her sister died -- that Robert Wagner knew Natalie Wood was in the water ... but instructed the captain of the yacht to "leave her there, teach her a lesson."
In an interview with TMZ, Lana says Captain Dennis Davern told her several details about Natalie's death ... including that there was a drunken fight between Wagner and Natalie that night in 1981.
Lana claims Wagner -- or RJ, as she calls him -- didn't call her until 2 days after Natalie's death and offered her no explanation, other than ... "it was an accident."
As for the reopening of the investigation, Lana says her sister "deserves the truth" -- and she never bought the official explanation about Natalie and the dinghy ... because she knows her sister was afraid she would die in "dark water."
Cpt. Says Wagner Left Wood
'To Teach Her a Lesson'
11/18/2011 11:50 AM PST BY TMZ STAFF
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