Spicer was in charge of a Scots Guards unit in Belfast in 1992, when two of his soldiers, Mark Wright and James Fisher, shot dead unarmed 18-year-old Catholic Peter McBride.
A military tribunal found the two guardsmen guilty of murder, but Spicer is reported to have helped them win early release from jail.
According to the Belfast-based Pat Finucane Centre for Human Rights and Social Change, Spicer also resisted prosecution of his guardsmen and wanted to send them back on patrol immediately after the killing.