Former Tigers and England rugby player Martin Johnson joined hundreds of people at an event to raise awareness of a potentially fatal medical condition.
The Joe Humphries Memorial Trust held an open day at Rothley church to raise money and make people aware of sudden arrhythmic death syndrome (SADS).
The cardiac condition claimed the life of 14-year-old Joe in October.
The schoolboy collapsed and died after going out for jog near his home in Rothley.
The trust was set up by Joe's family – dad Steve, mum Angela and sister Lauren – to raise awareness of the condition.
More than 400 people joined Martin, the charity's patron, at the open day.
Martin said: "This was an opportunity for people to learn about the trust and get involved as a volunteer, participant or supporter in helping us tackle SADS, so fewer people face the heartache and despair Steve, Angela and Lauren have had and continue to endure."
Former cardiac nurse Alan Harrison-White, who is the charity's community liaison officer, said: "The main thing was raising awareness of sudden arrhythmic death syndrome.
"We had various demonstrations and posters and leaflets about the condition."
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