Josh Greenberg, co-founder of the music streaming service Grooveshark, was found dead in his apartment on Sunday evening.

His girlfriend, Abby Mayer, who had just returned from a weekend trip in Orlando, saw him lying in bed and thought he was just sleeping. She called the police at 7 p.m. after discovering he was already dead. Mayer said she last spoke with Greenberg at 1:30 a.m. Sunday, The Gainesville Sun reports.

Greenberg's mother Lori said her son "looked like he was sleeping." She told The Gainesville Sun that the autopsy did not show any possible explanation for her son's cause of death. Toxicology tests will be conducted, and the results will be out in two or three months.

Gainesville police ruled out foul play or suicide.

Greenberg's death comes a few months after Grooveshark shut down in April 30. The company stopped operations after losing a copyright-infringement lawsuit filed by industry giants Sony Music Entertainment, Universal Music Group and Warner Music Group.

In a statement published on Grooveshark's website, the company said, "We started out nearly ten years ago with the goal of helping fans share and discover music. But despite best of intentions, we made very serious mistakes. We failed to secure licenses from rights holders for the vast amount of music on the service. That was wrong. We apologize. Without reservation."

Escape Media Group, the parent company of Grooveshark, said it will pay $75 million to the three major recording labels if Grooveshark violates the settlement terms, Mirror reports.

Lori Greenberg said her son was not depressed by the outcome of the lawsuit, but was relieved it was over.

"He was excited about potential new things that he was going to start," she told The Gainesville Sun.

Greenberg founded Grooveshark together with Sam Tarantino in 2006 when they were freshmen at the University of Florida.

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