In a handwritten letter, Costa described how he was affected by the media coverage following the death of one of the program's contestants.
The hit reality show, "Koh-Lanta," tests players' survival skills by putting them through a series of challenges and rewarding success with prizes and money. Gerald Babin, a 25-year old participant, died on March 22 after suffering a heart attack during the first challenge of the 2013 season.
"These past days, my name has been smeared in the media," the 38-year-old Costa wrote in a suicide note, which he requested be made public. Addressing his 20 years in the profession, the man said he had a feeling that all his efforts were diminished by what he called misleading stories.
After receiving anonymous testimony about certain "failures" regarding Babin's death, several French journalists questioned the contestant's cause of death, along with Costa's role in his passing.
Adventure Line Productions (ALP), which produces the show, on Thursday filed a defamation suit against anyone who sought to exploit Babin's passing. However, a second witness came forward Friday and cast more doubt on the circumstances of Babin's death.
Costa served as the staff doctor on "Koh-Lanta" for four seasons, ALP confirmed in a statement. The production company commended Costa for his high level of professionalism and his humanity toward both the show's participants and production crews.
ALP also addressed the media in its statement, advising that "this tragic event should encourage those who accuse and comment indiscriminately to exercise responsibility."
As the Agence France-Presse notes, though Cambodian authorities declared Babin died of natural causes, French authorities have launched their own investigation into his cause of death.
Related on HuffPost:
An Indian child, face smeared with colored powder, celebrates Holi festival in Mumbai, India, Wednesday, March. 27, 2013. (AP Photo/Rajanish Kakade)
People on boat enjoy the blooming cherry blossoms along the Chidorigafuchi Imperial Palace moat in Tokyo, Sunday, March 24, 2013. (AP Photo/Shizuo Kambayashi)
A Seleka rebels sits in the pillaged office of deposed president Francois Bozize in Bangui, Central African Republic on March 28, 2013. (SIA KAMBOU/AFP/Getty Images)
Two boys watch as ultra-Orthodox Jewish men, not seen, burn leavened items in final preparation for the Passover holiday in the ultra-Orthodox Jewish town of Bnei Brak, near Tel Aviv, Israel, Monday, March. 25, 2013. (AP Photo/Oded Balilty)
Young Indian Christian devotees hold palm leaves during a Palm Sunday procession in Hyderabad, India, Sunday, March 24, 2013. (AP Photo/Mahesh Kumar A.)
Penitents from the Cristo de la Buena Muerte or "Good Dead Christ" brotherhood take part in a procession in Zamora, Spain, in the early hours of Tuesday, March 26, 2013. (AP Photo/Daniel Ochoa de Olza, File)
Ultra Orthodox Jewish children gather around a baby donkey as they take part in the 'Pidyon Peter Chamor' ceremony, or the 'Redemption of the first born donkey' in the Meir Sharim neighborhood on March 28, 2013 in Jerusalem, Israel. (Photo by Uriel Sinai/Getty Images)
An Afghan prisoner waits in line for his release from Parwan Detention Facility after the U.S. military gave control of its last detention facility to Afghan authorities in Bagram, outside Kabul, Afghanistan, Monday, March 25, 2013. (AP Photo/Anja Niedringhaus)
Hindu devotees play with colour during Holi celebrations at the Banke Bihari temple on March 27, 2013 in Vrindavan, India. (Photo by Daniel Berehulak/Getty Images)
A penitent of "Santisimo Cristo de las Injurias" brotherhood takes part in a Holy Week procession in Zamora, northern Spain, Wednesday, March 27, 2013. (AP Photo/Daniel Ochoa de Olza)