Title: Bobby Darin
Content:  in Los Angeles at the time of Robert Kennedy's assassination. During the same year, he discovered the woman who had raised him was his grandmother, not his mother as he thought, and learned that the woman he thought was his sister was actually his mother. Those events deeply affected Darin and sent him into a long period of seclusion. Although he made a successful comeback (in television) in the early 1970s, his health was beginning to fail, as he had always expected, following bouts of rheumatic fever in childhood. The knowledge of his vulnerability had always spurred him on to use his musical talent while still young. He died at the age of 37 after a heart operation in Los Angeles.
Title: Bobby Darin
Content:  In 1973, after failing to take antibiotics to protect his heart before a dental visit, Darin developed sepsis, an overwhelming systemic infection, which further weakened his body and affected one of his heart valves. On December 11, he checked himself into Cedars of Lebanon Hospital in Los Angeles for another round of open-heart surgery to repair the two artificial heart valves he had received in January 1971. On the evening of December 19, a four-person surgical team worked for over six hours to repair his damaged heart. Shortly after the surgery ended in the early morning hours of December 20, 1973, Darin died in the recovery room without regaining consciousness. He was 37 years old. Darin's last wish in his will was that his body be donated to science for medical research. His remains were transferred to the UCLA Medical Center shortly after his death.
Title: Bobby Darin
Content:  Darin suffered from poor health his entire life. He was frail as an infant and, beginning at age eight, was stricken with recurring bouts of rheumatic fever that left him with a seriously weakened heart. During his first heart surgery, in January 1971, he had two artificial valves implanted. He spent most of that year recovering from the surgery. During the last few years of his life, he was often administered oxygen during and after his performances on stage and screen.
Title: Bobby Darin
Content:  In the summer of 1957, while performing in Detroit, Darin met a waitress named Lillian Sweet, who secretly gave birth to the singer's child. The baby was adopted as an infant and named Sam Tallerico. Darin married actress Sandra Dee on December 1, 1960. They met while filming Come September (which was released in 1961). On December 16, 1961, they had a son, Dodd Mitchell Darin (also known as Morgan Mitchell Darin). Dee and Darin divorced on March 7, 1967. Darin's second wife was Andrea Yeager, a legal secretary he met in 1970 and married on June 25, 1973, after the couple had lived together for three years. Four months later, in October 1973, the couple divorced amid strain caused by Darin's worsening health problems.
Title: Bobby Darin
Content:  her baby off as Nina's younger brother. Darin believed his mother Nina was instead his elder sister and that Polly, who had raised him from birth, was his mother. In 1968, when he was 32 and considering entering politics, Nina told him the truth, reportedly devastating Darin. She refused to reveal the identity of his biological father, and kept that secret to her death in 1983. By the time he was a teenager, Darin could play several instruments, including piano, drums, and guitar. He later added harmonica and xylophone. Darin moved to the Bronx early in his life (with a rented summer home 
Title: Bobby Darin
Content:  Darin was an enthusiastic chess player. His television show included an occasional segment in which he would explain a chess move. He arranged with the United States Chess Federation to sponsor a grandmaster tournament, which pitted him against the young Eastern Division champion Stephen Ryder, with the largest prize fund in history, but the event was canceled after his death.
Title: Bobby Byrd
Content:  Bobby Byrd died on September 12, 2007, of cancer; he was 73 years old.
Title: Bobby Doerr
Content:  Doerr died on November 13, 2017, in Junction City, Oregon, at the age of 99.
Title: Bobby Darin
Content:  In 1990, Darin was inducted into the Rock and Roll Hall of Fame, with singer and close friend Paul Anka announcing the honor. In 1999, Darin was voted into the Songwriters Hall of Fame. Songwriter Alan O'Day alluded to Darin and his recording of "Mack the Knife" in the song "Rock and Roll Heaven" (made a hit by the Righteous Brothers), a tribute to dead musicians, which O'Day wrote shortly after Darin's death. On May 14, 2007, Darin was awarded a star on the Las Vegas Walk of Stars to honor his contribution to making Las Vegas the "Entertainment Capital of the World" and named him one of the twentieth century's greatest entertainers. Fans paid for the star. Darin also has a star on the Hollywood Walk of Fame. On December 13, 2009, at its 2010 Grammy Awards ceremony, the Recording Academy awarded Darin a posthumous Lifetime Achievement Award. Bobby Darin was among hundreds of artists whose material was destroyed in the 2008 Universal fire.
Title: Bobby Breen
Content:  He died of natural causes in Pompano Beach, Florida, on September 19, 2016, three days following the death of his wife.

Question: what did bobby darin die of?
Answer: Surgical complications.