The show's staff and writers occasionally make jokes about Daniel's frequent "deaths" on the show. In the season 7 episode "Heroes", one of the SG teams examine some ancient ruins and a scientist says "Dr. Jackson is gonna die when he sees this!" to which another member (Col. David Dixon, played by Adam Baldwin) responds "What?! Again?". Comparisons have also been made between Daniel and Kenny from the cartoon series South Park. Daniel's first death is by staff blast while he defends O'Neil; he is resurrected by Ra with a sarcophagus in the film. Daniel flat lines in Season 4's "The Light". He dies of radiation poisoning in season 5's "Meridian" and Ascends to a higher plane until he reappears in Season 7's "Fallen (part 1)". He is killed by RepliCarter at the very end of "Reckoning" and is seen at a midway point between Ascension and mortality before finally retaking human form in "Threads". Daniel is presumed dead after SG-1 is brainwashed to believe this in Season 1's "Fire and Water". Daniel also is killed by Teal'c several times in a virtual reality system in Season 8's "Avatar". Other deaths generally involve Daniel's teammates: they die together in "The Nox" (where they get resurrected by the Nox) and in the alternate future of "2010"; their robot versions are killed in "Double Jeopardy", Daniel being the first to die; and a Goa'uld-possessed alternate timeline version of Daniel is shot by Teal'c in "Moebius", while in another timeline in the same episode, all of SG-1 are killed except Daniel.
-Wikipedia artigo sobre Daniel Jackson.
Como HorusKul apontou em seu comentário, a morte se torna um pouco mais difícil de definir, uma vez que estamos lidando com tecnologia médica SF que pode ressuscitar personagens a partir de um ponto em que eles seriam considerados biologicamente mortos. A população geral do SCG certamente o percebeu como morto várias vezes, começando por "Fogo e Água" na primeira temporada, embora ele não estivesse realmente morto. Eu imagino que eles também estão se referindo à ascensão dele, que pode não ter contado como morte a partir de sua perspectiva, mas provavelmente estava perto o suficiente disso para todos os outros.