LONDON — The story of Keira Ball, a sprightly 9 year old, did not end in the summer of 2017, when she was fatally injured in a car accident in England. Her parents consented to donating her organs, saving the life of Max Johnson, also 9, whose heart was failing because of an infection.

Pictures of these two children, who never met in life, have been on newspaper front pages and news broadcasts in Britain this week, the most highly publicized of the cases that have helped win passage of what has been called Max and Keira’s law. It is intended to boost Britain’s low rate of organ donations by making most adults presumed organ donors by 2020.

Under the new system, which was expected to win final approval in Parliament on Tuesday, adults living in England, with narrow exceptions, would be considered potential donors unless they had expressed objections. Wales already has a presumed consent or “opt-out” system, and on Tuesday, Scotland’s Parliament debated a bill to create a similar one.