Beth Morris has revealed she pulled out of The Voice because of drug problems.
The singer quit hours before the first live show. Chloe Castro also left the show before the quarter finals because of unconnected "health reasons".
Beth told The Sun on Sunday that she realised she had a problem with cocaine two years ago.
She said: "I was using them [drugs] to cope with various issues I was going through.
"I thought they would help me, but they were making the situation worse."
All four coaches - Paloma Faith, Ricky Wilson, will.i.am and Boy George - turned their chairs for Beth at the blind audition stage when she sang Tina Turner's Nutbush City Limits.
The singer chose to join Paloma's team and made it through to the live quarter-finals.
She told the newspaper she had realised it was time to do something about her addiction and checked herself into The Priory treatment centre.
"Addiction is tough and I am sorry to say that I have relapsed on a few occasions," she explained.
"When this has happened I have immediately sought help and I regularly attend Narcotics Anonymous meetings.
"I'm truly sorry I've let everyone down but I'm determined to put this behind me."
Paloma tweeted she was "very sad" that Beth wouldn't be on the show anymore.
Beth thanked Paloma in her statement.
"Being on The Voice has been the best experience of my life, the production team and contestants have all been incredible and I have loved performing on the show.
"Paloma has also been a great support."
Chloe Castro, who was on Ricky Wilson's team, also left the competition before the live shows.
The singer said: "I have decided to leave The Voice for health reasons. I have had a fantastic time and wish all the other contestants all the best in the competition."
Chloe Castro with coach Ricky Wilson
The early departures meant two contestants left Saturday's show instead of four.
Lauren Lapsley-Browne from Team Will and Harry Fisher, who was being coached by Boy George, were voted off - leaving the final eight to go through to the semi-finals.
Click here for all the results from the live quarter-finals.
The Voice semi-finals are live on BBC1, Saturday, April 2, 7.00pm.
