A worker died on Friday in construction work at the World Cup stadium in Manaus, bringing the stadium's death toll to four ahead of the tournament which begins in June.
The 55-year-old worker was hit on the head by a falling part during efforts to dismantle a crane.
The crane had been used at the stadium but was being dismantled close-by, at the Manaus sambadrome, the construction company in charge of the works, Andrade Gutierrez, said.
The worker was taken to hospital but later died of wounds to his head and his torso, the state news agency Agencia Brasil reported.
The man is the third fatal victim of construction works in the World Cup host city Manaus.
In March 2013, one worker died in a fall, and in December another died when he fell down almost 40 metres from a crane. A fourth worker died at the site of a heart attack last year.
Stadium works in Manaus, where four group games are set to be played in the tournament that starts June 12, were scheduled to be completed next week and were ongoing despite the latest accident.
A further three people have been killed in World Cup stadium works elsewhere.
In June, a worker was killed as he fell from a height of 30 metres at the stadium in Brasilia, and in late November a crane collapsed killing two workers and damaging a portion of the roof and the stands in Sao Paulo, the stadium that is set to host the World Cup's opening game.
Workers in Manaus complained last year about the pressure that was being put on them to make progress on the Arena da Amazonia.
The 12 World Cup stadiums were expected to be completed by the end of last year. Six were already used in last year's Confederations Cup, widely regarded as a dress rehearsal for the World Cup.
Of the six remaining venues, only the stadium in Natal has been completed and five are still in construction.
In Curitiba, delays are so significant that there is a risk that the city might be dropped from the World Cup altogether, while works in Sao Paulo's Arena Corinthians are not expected to be finished until mid-April, as a consequence of the crane accident in November.
