A 27-year-old man has been given nine-year prison sentence, with three years suspended, for supplying cocaine to a party in Waterford in December 2007.
Two Waterford men died following the party.
Anthony Connolly, of Priory Lawn in the Ballybeg housing estate in the city, pleaded guilty to the possession of cocaine for sale or supply at a party in Ballybeg Square in November 2007.
Kevin Doyle, 21, and John Grey, 23, became critically ill and later died after ingesting cocaine and ecstasy at a party in Mr Grey's home on 25 November 2007.
Mr Doyle died at Waterford Regional Hospital on 4 December, while Mr Grey died at the hospital four days later.
The charges arise from a party that began on Saturday 24 November 2007 at a bar in Waterford city, to celebrate Mark Grey's 21st birthday.
Detective Garda Paul Murphy said in court today that alcohol and ecstasy were taken by some partygoers.
Connolly, who suffers from learning difficulties, appeared at the court today for supplying the drugs to the party at Ballybeg Square.
Sentencing Connolly, Judge Rory MacCabe extended his sympathies to both Grey and Doyle families.
