[7] Lázaro was the first athlete to die during a modern Olympic event after collapsing at the 30-kilometer mark (19 miles) of the marathon with a body temperature of 41 °C (105.8°F).

The cause of death was initially thought to be severe dehydration due to the high temperature registered at the time of the race.

Later, it was discovered that Lázaro had covered large portions of his body with suet to prevent sunburn and to help with speed and lightness while running, but eventually, the wax restricted the athlete's natural perspiration, leading to a fatal body fluid electrolyte imbalance.

[8] Approximately US$3,800 (equivalent to $120,000 in 2023) was collected for his wife, and later a monument of Lázaro was placed at the marathon's turning point at Sollentuna, Stockholm.

[9] The novel The Piano Cemetery, by Portuguese novelist José Luís Peixoto, is based on Francisco Lázaro's story.