Duckenfield was accused of the gross negligence manslaughter of 95 Liverpool fans.
But the jury found Graham Mackrell GUILTY of a health and safety breach linked to the 1989 football disaster.
'Hung jury' means that required majority of jury unable to agree on a verdict one way or another. The CPS will now carefully consider the position - it may decide to proceed with a retrial against Duckenfield, but it may also decide not to proceed.
It is understood the prosecution will seek a retrial of David Duckenfield.
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Ninety-six men, women and children died in the crush in pens at the Leppings Lane end of the Sheffield Wednesday ground at the match between Liverpool and Nottingham Forest.