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High school American footballer Zac Easter took his own life after developing Chronic Traumatic Encephalopathy (CTE) - a rare degenerative brain condition.

A study from Boston University found 99% of American football subjects developed CTE - which is linked to suffering repeated blows to the head.

Zac's mother, Brenda, told ÃÛÑ¿´«Ã½ Radio 5 Live Sport more needs to be done to protect players from head traumas in sport.

This clip was first broadcast on ÃÛÑ¿´«Ã½ Radio 5 Live Sport on Wednesday, 16 August 2017.