'Voice' singer Melanie Martinez accused of sexual assault by former best friend

"The Voice" alum Melanie Martinez's former best friend says the singer sexually assaulted her.

Timothy Heller, who is also a musician, detailed the alleged incident on Twitter, writing Monday that Martinez "performed oral sex" and penetrated her with a sex toy without her consent.

Heller described the two as having an intense co-dependent relationship that took a turn over the course of a two-night sleep over.

"I never said yes. I said no, repeatedly," wrote Heller, who says she previously suffered from sexual abuse. "But she used her power over me, and broke me down. Just so there is no confusion, I was molested by my best friend."

She said they never spoke of the night again and their friendship ended sometime after.

Heller's former band Dresses performed with Martinez in 2014 at a show in Nashville. She's since become a solo artist, dropping her first single in October.

Martinez is one of the few success stories from the NBC reality singing competition, placing in the Top 6 during the series' third season. She went on to release her debut studio album, "Cry Baby," in 2015, which spawned the hit single "Pity Party."

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'The Voice' alum Melanie Martinez
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'The Voice' alum Melanie Martinez
CHARLOTTE, NC - AUGUST 26: Singer Melanie Martinez performs at Amos' Southend on August 26, 2015 in Charlotte, North Carolina. (Photo by Jeff Hahne/Getty Images)
NEW YORK, NY - MARCH 25: Melanie Martinez attends AOL Build Speaker Series to discuss 'Cry Baby' at AOL Studios In New York on March 25, 2016 in New York City. (Photo by Jamie McCarthy/Getty Images)
AUSTIN, TX - MARCH 21: Singer-songwriter Melanie Martinez performs onstage during Perez Hilton's One Night in Austin at Austin Music Hall on March 21, 20
NEW YORK, NEW YORK - MARCH 25: Melanie Martinez attends the AOL Build Speaker Series to discuss 'Cry Baby' at AOL Studios In New York on March 25, 2016 in New York City. (Photo by D Dipasupil/FilmMagic)
NEW YORK, NY - MARCH 25: Singer Melanie Martinez attends the AOL Build Speaker Series to discuss 'Cry Baby' at AOL Studios In New York on March 25, 2016 in New York City. (Photo by Mike Pont/WireImage)
SEATTLE, WA - FEBRUARY 20: Singer Melanie Martinez performs on stage during the 'Cry Baby' tour at the Showbox on February 20, 2016 in Seattle, Washington. (Photo by Mat Hayward/Getty Images)
CHICAGO, IL - JULY 28: Melanie Martinez performs during Lollapalooza at Grant Park on July 28, 2016 in Chicago, Illinois. (Photo by Tim Mosenfelder/Getty Images)
ATLANTA, GA - SEPTEMBER 18: Melanie Martinez performs onstage at Piedmont Park on September 18, 2016 in Atlanta, Georgia. (Photo by Paul R. Giunta/WireImage)
CHICAGO, IL - JULY 28: Melanie Martinez performs during Lollapalooza at Grant Park on July 28, 2016 in Chicago, Illinois. (Photo by Daniel Boczarski/Redferns)
AUSTIN, TX - OCTOBER 01: Melanie Martinez performs during the Austin City Limits Music Festival at Zilker Park on October 1, 2016 in Austin, Texas. (Photo by Tim Mosenfelder/Getty Images)
BERLIN, GERMANY - NOVEMBER 13: American singer Melanie Martinez performs live during a concert at the Huxleys on November 13, 2016 in Berlin, Germany. (Photo by Frank Hoensch/Redferns)
SAO PAULO, BRAZIL - MARCH 26: American singer Melanie Martinez performs during a show as part of the Lollapalooza Festiva Sao Paulo 2017 at Interlagos Racetrack on March 26, 2017 in Sao Paulo, Brazil. (Photo by Levi Bianco/Brazil Photo Press/LatinContent/Getty Images)
SAO PAULO, BRAZIL - MARCH 26: Melanie Martinez performs live on stage during day two of Lollapalooza Brazil at Autodromo de Interlagos on March 26, 2017 in Sao Paulo, Brazil.(Photo by Mauricio Santana/WireImage)
SAO PAULO, BRAZIL - MARCH 26: Melanie Martinez performs live on stage during day two of Lollapalooza Brazil at Autodromo de Interlagos on March 26, 2017 in Sao Paulo, Brazil. (Photo by Mauricio Santana/Getty Images)
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The singer responded to Heller's account early Tuesday morning, saying that she is "horrified and saddened" by her statements.

"What she and I shared was a close friendship for a period of time. We came into each other's lives as we were both starting our careers as artists, and we tried to help each other," Martinez wrote on Twitter. "We both had pain in dealing with our individual demons and the new paths we were forging, but I truly felt we were trying to lift each other up. She never said no to what we chose to do together. And although we parted ways, I am sending her love and light always."

Heller said she initially didn't intend to name her alleged abuser, but chose to come forward in the wake of the sexual assault stories that have come to light over the past few months.

"The only reason I do this now is because I'm hoping because of recent events, people will believe me," she wrote. "Friendship does not equal consent. Silence doesn't equal consent. I wish it wasn't so hard for me to convince myself of these things."

  • This article originally appeared on HuffPost.
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