Frans Pop is a confirmed suicide (more details). Significantly, he resigned the night before Debian Day for the purpose of suicide and he wrote multiple grievances.
Ian Murdock, Debian's founder, is a confirmed suicide. (more details).
Joel "Espy" Klecker, a 21-year-old suffering from a rare disease, is a suspected case of medically-assisted suicide (euthanasia). (more details).
Lucy Wayland: the coroner's report states that the cause of death was an accident and that Wayland was alone and suffering from alcohol dependency. (more details).
Jens Schmalzing died in Germany where the coroner's report is kept secret. Without access to the official cause of death, there is no distinction between an accident and a suicide. Schmalzing's death involved falling from a rooftop. (more details).
Thiemo Seufer died in Germany where the coroner's report is kept secret. Without access to the official cause of death, there is no distinction between an accident and a suicide. Records show he was working on Christmas Day, which is illegal in Germany and the speculated car accident occurred later that night. Furthermore, if a vehicle accident involved lack of sleep, excessive working hours, the coroner's findings in such matters are secret. (more details).
William Lee Irwin III was reported to be having a crisis and living in a homeless shelter. He subsequently vanished and all the discussion about him stopped. More details may have been shared on IRC. We do not officially know if he is still alive. (more details).
Chris Rutter died crossing the road. News reports suggest the driver was not at fault. Records show Rutter was often doing his unpaid Debian work up to 3am while in his first year of undergraduate study, depriving him of sleep. (more details).
Manuel Estrada Sainz and Andres Garcia died in a car accident driving home from a conference on a Sunday night. They had almost completed the 666km journey when they had the accident in what appear to be sleep-deprived conditions. (more details (Estrada)) and (more details (Garcia)).
Adrian von Bidder died around the time the local group in Switzerland began preparing their bid to host DebConf13. Martin Krafft told us he might have had a heart attack (he was aged 34) and no official confirmation was ever provided. (more details).
Clytie Siddall died early in 2015, during another one of the peak periods of conflict in Debian. She had publicly revealed she was suffering from Myalgic Encephalomyelitis/Chronic Fatigue Syndrome. Victims of this disease are six times more likely to die of suicide. (more details)
Abraham Raji died at DebConf23. He drowned while other members of the group were kayaking. People abandoned the search and his body had to be recovered by the local residents. (more details)
Peter de Schrijver (p2 / p2mate) died immediately after the latest attacks on another volunteer. It is a familiar pattern, one volunteer's family is attacked and another volunteer dies. Cause of death was withheld. (more details)
Debian Suicide Cluster appears to be real
Public Health England defines a suicide cluster as three or more self-inflected deaths in the same community or group. Is there a Debian Suicide Cluster?
Fellowship's list of suicides and accidental deaths
The Fellowship volunteers also created a list with some additional suicides and accidental deaths in other open source "communities".
