At Ennis Circuit Court, Judge Brian O’Callaghan imposed a 15 month prison term suspending the final 12 months on Mr Casey of O’Briensbridge in south east Clare.
Judge O'Callaghan also imposed a four year driving ban on Mr Casey.
Earlier this month, Mr Casey, better known as rapper, Willzee won the Music, Arts and Culture award at the Irish Traveller Pride Awards.
Judge O’Callghan said that the case involved ‘aggravating factor after aggravating factor’ and said that Mr Casey had maintained a lie that the now deceased Mr Moran was the driver of the car when in fact Mr Casey was the driver in the single vehicle crash at Ardclooney, Killaloe in east Clare on November 7th 2017.
Judge O'Callghan said that Mr Casey "is now fully remorseful".
Mr Moran (27) was a back seat passenger in the car that also had three other passengers and four ambulances arrived at the scene after 4am to take the injured away.
Mr Moran died three days later in hospital from his injuries.
In her victim impact evidence, sister of Christopher Moran, Tracy Moran said that for three years the family were left not knowing what happened on the night of November 7th 2017.
She said that Christopher’s two young girls were left without a father and they lost their mother a number of months later through an overdose.
Ms Moran said that the family would have accepted an apology from Mr Casey over what happened as she understood that accidents happen.
She recounted how when family members were at Christopher’s bedside in hospital, her brother got a phone call from William Casey who said that he wasn’t driving the car but that Christopher was.
She said: “William Casey never apologised or showed any remorse.”
Mr Casey maintained the lie and went on trial for dangerous driving causing the death of Mr Moran in June of last year at Ennis Circuit Court and pleaded guilty to careless driving causing death two days into the trial.
Mr Casey was disqualified from driving at the time of the crash in November 2017.
A worker with the Tipperary Rural Traveller Project, Jack Griffin gave character evidence on behalf of Mr Casey.
Mr Griffin said that “William has been on the Claire Byrne show on RTE and other national media and has tried to be a positive voice for young travellers”.
Mr Griffin said that Mr Casey is a talented musician, poet and artist and won a National Traveller Pride award earlier this month.
Asked about the impact of the crash on Mr Casey, Mr Griffin said: “I think what happened on the night was absolutely horrific. William for a long time found it hard to come to terms with his guilt and shame around it.”
Mr Griffin said that what happened that night “put William in a very dark place for a long time and he is working through that and he struggled”.
Mr Griffin said that Mr Casey “has worked tirelessly to bring something positive to his family and his community”.
In a letter of apology read out in court, Mr Casey apologised to the Moran family for the hurt he has caused them.
He said: “It was never my intention to hurt anyone.”
He said that he was “fully responsible for my actions on the night”.
He said: “If there was any way of going back and trading places, I would in a heart beat.”
Mr Casey said: “I honestly hate myself for the decisions I made that night and it has taken me a while to come to terms with the disgusting way I behaved.”
Counsel for the State, Lorcan Connolly BL said that because Mr Casey told Gardai on the night that he wasn’t driving he couldn’t be tested for drink driving.
Mr Casey embraced and kissed on the cheek his foster mother in court before being led away to the courthouse cell by prison guards to commence his three month prison sentence.