A close friend of Mac Miller’s has come forward in the wake of the 26-year-old's unexpected death to reveal ex-girlfriend Ariana Grandewas one of the biggest proponents of Miller’s sobriety.

On Monday, Shane Powers paid tribute to Miller on his podcast The Shane Show. During their friendship, Powers saw firsthand in Los Angeles just how much Grande cared for and supported Miller. “They were very much in love and I have to say, she was incredible when he was first sobering up,” Powers said. “She was a fucking G to him. There could not have been anybody more supportive of him being sober than Grande. I saw that, I was around it. I took phone calls from her. ‘How do I help, what do I do?’”

He continued, “This little girl was unbelievably involved and helpful to him being healthy. Because whether he was an addict or not, the way that Mac partied was not healthy. I gotta tell you, man, there was no one in his life more ready to go to the wall for him when it came to him being sober. She was an unbelievably stabilizing force in his life.”

Powers also took to Twitter to defend Grande, writing, “Ariana Grande didn’t kill Mac. Mac killed Mac. Leave her alone. He’d be furious with ANYONE who made any shitty comment to her. I’d fuckin know. Leave her alone.”

Hours after Mac Miller was found dead on Sept. 7, angry fans began harassing Grande on Instagram, which prompted her to disable comments on her account. The day after Miller passed, Grande posted a photo of Miller on Instagram as a tribute.