Question: How did Sue Carols' third husband pass away?

Context paragraphs:
Ru Baru: 'Ru Baru' (English: Face-to-Face) is a Pakistani drama serial that is airing on Hum TV.  The show is written by Hoor Shumail, Produced by Momina Duraid, directed by Saife Hassan, and background music is done by Furqan and Imran.  The story centers around Shabeeh and Tipu's marriage.  Shabeeh, lives with her grandmother and uncles, after her parents pass away and is brought up by the maternal family.  She marries her cousin’s friend, Sarmad, who has severe mood swings and some psychological issues.  She discovers that her mother had an affair with Sarmad's father and eventually became his step-mother.  Tipu is in love with his cousin and marries her; Kiran becomes paranoid and suspicious about Tipu cheating on her which eventually leads to divorce.  The drama serial premiered on 9 January 2014 in Pakistan, with the prime slot of 8:00 pm every Thursday on the channel Hum TV.

Sue Carol: Sue Carol (October 30, 1906 – February 4, 1982) was an American actress and talent agent.  While at a social function in Los Angeles in 1927, a director offered her a part in a film.  She took it and began playing minor parts.  Carol's film career lasted from the late 1920s into the 1930s; when it ended, she became a talent agent.  The last of her three marriages was to one of her clients, Alan Ladd, from 1942 until his death in 1964.

Roll on the Red Tour: The Roll on the Red Tour was a concert tour by American rock band Red Hot Chili Peppers.  The tour followed the band's hugely successful "By the Way tour".  During this tour the band recorded their first live album, Live in Hyde Park.  Near the tour's end, the dates mainly consisted of benefit and tribute shows including the Bridge School Benefit and a tribute show to longtime friend, Johnny Ramone.  The band's performance was released two years later on DVD as "Too Tough to Die: A Tribute to Johnny Ramone".  Ramone, who was too sick to attend the tribute (although show host, Rob Zombie called him during the event), would pass away a three days after the tribute show.  John Frusciante was among many famous friends and family to attend his funeral and memorial celebration.  On March 17, 2015, the band released "" a free MP3 download of the entire show through their website.

Buddha's Dispensation: Buddha's Dispensation (Buddha-sasana) is the time period which Dharma (Pali Canon) exist and follow.  It is totally 5000 years after the Buddha's Parinirvana (pass away or "Skandha Parinirvana").  There are three types of Parinirvana those are "Klesha Parinirwana", "Skandha Parinirvana" and "Dhatu Parinirvana".

Alan Ladd: Alan Walbridge Ladd (September 3, 1913 – January 29, 1964) was an American actor and film and television producer.  Ladd found success in film in the 1940s and early 1950s, particularly in Westerns such as "Shane" (1953) and films noir in which he was often paired with Veronica Lake, such as "This Gun for Hire" (1942), "The Glass Key" (1942) and "The Blue Dahlia" (1946).  Other notable credits include "Two Years Before the Mast" (1946), "Whispering Smith" (1948) and "The Great Gatsby" (1949).  His popularity diminished in the late 1950s, though he continued to appear in popular films until his accidental death due to a lethal combination of alcohol, a barbiturate, and two tranquilizers.

The Karate Guard: The Karate Guard is a 2005 Tom and Jerry cartoon short directed by Joseph Barbera and Spike Brandt.  It was the last Tom and Jerry cartoon to be written, co-storyboarded, co-directed and co-produced by the characters' co-creator Joseph Barbera (who would pass away in late 2006).  This is also, to date, the last theatrical cartoon to feature or star Tom and Jerry.  It premiered in a limited theatrical run in Los Angeles cinemas on September 27, 2005, then saw its television debut on Cartoon Network on  27, 2006 (2006--) .

Word taboo: Word taboo is the restricted use of words due to social constraints.  The taboo against naming the dead in parts of the world is an example.  Taboo words are commonly avoided with euphemisms, such as the English euphemism "pass away", meaning "die".  It is a common source of neologisms and lexical replacement.

Sōtō: Sōtō Zen or the Sōtō school (曹洞宗 , Sōtō-shū ) is the largest of the three traditional sects of Zen in Japanese Buddhism (the others being Rinzai and Ōbaku).  It is the Japanese line of the Chinese Cáodòng school, which was founded during the Tang Dynasty by Dòngshān Liánjiè.  It emphasizes Shikantaza, meditation with no objects, anchors, or content.  The meditator strives to be aware of the stream of thoughts, allowing them to arise and pass away without interference.

Pass away: Pass away is a euphemism for die.

Lotte Weeda: Lotte Weeda is a romance novel by Dutch author Maarten 't Hart.  It was first published in 2004.  It narrates the story of the panic that starts in a village in the province of Zuid-Holland (South-Holland) after several villagers pass away shortly after they have been depicted in a photo book.

Supporting paragraphs: Sue Carol Alan Ladd
Answer: accidental death due to a lethal combination of alcohol, a barbiturate, and two tranquilizers.