He was taken into custody not long before the band was to open for Soundgarden at a Massachusetts show.
Police have arrested Coheed and Cambria bass player Mike Todd for allegedly robbing a pharmacy.
The Attleboro, Mass., police department said they responded to a report of a robbery around 1 p.m. Sunday at a Walgreens.
"Upon arrival, it was learned that a male had threatened a pharmacist with a bomb threat and demanded Oxycontin," police told The Hollywood Reporter in a statement. "The male was given six bottles of pain pills."
He then was seen by a passerby getting into a cab, which police discovered was headed to the Comcast Center, where Coheed and Cambria were supposed to open for Soundgarden that night. (Soundgarden recently kicked off a reunion tour.)
Todd, 30, was then arrested and charged with armed robbery and possession of a class B controlled substance. He is being held at Attleboro PD on $10,000 bail.
On its website, Coheed and Cambria addressed Todd's arrest, saying he's off the tour.
"Michael Todd was arrested today on what we consider very serious charges and therefore he will not be finishing up the current tour," a statement read. "Wes Styles, longtime member of the Coheed family, will take on bass duties starting tomorrow for the remaining dates. No shows will be canceled.
"We are surprised to say the least and will address the situation with Michael after the tour. For now, we just want to have a great time out here and finish with some killer shows in Boston, Poughkeepsie, Quebec City and Halifax."
Hours after the arrest, 311 bassist P-Nut tweeted, "My boy Michael Todd from Coheed held up a Walgreens to snag some drugs. Wow. Time to get fully sober homey. #think"
Coheed and Cambria has released five studio albums, including its most recent, Year of the Black Rainbow, in 2010.