ryan o'neal
The "Love Story" actor died on Dec. 8, but the cause of his death was just made public.
Tatum O'Neal began acting besides her father, but the pair had a tumultuous relationship and were once estranged for decades.
The actor was nominated for a Best Actor Oscar for 1970's "Love Story," and appeared in classics like "Paper Moon," "Barry Lyndon" and "What's Up, Doc?"
The pair returned to their old stomping grounds 45 years after the iconic film's release.
