'Fair City' star Tommy O'Neill will be the subject of Sunday night's 'Would You Believe?' programme on RTÉ One.

The writer and performer, who plays Detective John Deegan in 'Fair City', battled heroin addiction and alcoholism and spent time in prison for armed robbery before finding his calling as an artist.

O'Neill gave himself up to police after hearing a voice he describes as God and in a candid interview says: "I couldn't stop drinking. I would sometimes be drunk for 18 months and in the end it didn't matter what I put into me, I just needed to get away from Tommy and the farther away the better."

'Would You Believe?' airs on RTÉ One on Sunday, 14 March at 10:25pm.