Stephen Chamberlain, once Mike Lynch's co-defendant in the U.S. fraud trial over the sale of Autonomy to Hewlett-Packard, has died after a road accident left him critically injured, days before Lynch went missing off the coast of Sicily, his lawyer said on Monday.

Chamberlain - Autonomy's former vice president of finance alongside chief executive Lynch - was hit by a car in Cambridgeshire on Saturday morning and had been placed on life support, a person familiar with the matter told Reuters earlier on Monday.

Previously: UK tech tycoon Mike Lynch among missing after luxury yacht sinks