Jared Leto-led rock band Thirty Seconds to Mars has lost its lead guitarist, with Tomo Milicevic announcing on social media that he has left the band.

The multi-instrumentalist’s announcement comes amid fan speculation about his future with the band after his absence from the band’s ongoing tour.

Back in April, the band released a statement announcing Milicevic would not be joining the band on its latest tour.

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“We wanted to let you know that Tomo is taking a break from tour to deal with some personal matters,” reads the statement. “Thank you for respecting his privacy at this time. We will be continuing the Monolith Tour and are looking forward to seeing you all on the road very soon.”

According to Milicevic — who co-founded the band with the “Dallas Buyers Club” Oscar winner and his brother, Shannon Leto, in 1998 — there appears to be no drama or rancor behind his decision to exit.

“I don’t really know how to explain in a note how I could have come to a decision like this,” he writes in a letter posted to Twitter, “but please believe me when I say that this is the best thing for me in my life and also for the band.”

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After thanking the Leto brothers for “allowing me the privilege to be a small part of their dream,” he ended the lengthy note with a message for the band’s fans.

You can read the entire message below.

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