Pantera bassist Rex Brown missed the band's performance at Knotfest Chile over the weekend.
In a statement obtained by Metal Hammer, festival organizers announced that Brown was unable to play the show due to "health problems."
That seems to be backed up by an Instagram post from drummer Charlie Benante, which reads, "We missed Rex tonight, get better buddy!"
According to Setlist.fm, Derek Engemann and Bobby Landgraf played bass in Brown's place. Engemann plays in vocalist's Phil Anselmo's Illegals band, while Landgraf previously played guitar in Down.
The Knotfest Chile show was part of Pantera's first tour with the reformed lineup of longtime members Anselmo and Brown alongside Anthrax's Benante and Black Label Society's Zakk Wylde in place of the late Abbott brothers, Vinnie Paul and "Dimebag" Darrell, respectively. The tour is scheduled to continue Monday with a headlining show in Chile.