Alice previously told Olivia that Derek died recently from trying to replace a faulty fuse after they flipped a coin to decide who would replace it .
Walter surmises that the parallel universe Alice died in a similar fashion due to a different outcome of the coin flip .
Alice previously told Olivia that Derek died recently from trying to replace a faulty fuse after they flipped a coin to decide who would replace it , and Walter surmises that the parallel universe Alice died in a similar fashion due to a different outcome of the coin flip .