He died suddenly in a car accident in 1968,[1] leaving his wife to raise seven children.

[4][7] Cué was educated at the local technical school and got his first job at the FN factory in Liège.

He became politically active as a teenager and joined the FGTB trade union on getting his first job.

[4] In 1997, Cué stood as a rank-and-file candidate for the General Secretary of the Union of Belgian Metalworkers and won.

[4] On 26–27 January, 2019, in Brussels, Cué and Slovene Violeta Tomić were voted by the Executive Board of the Party of the European Left as the top candidates for the 2019 European Parliament election.