Bertrand shot his male co-worker several times in the chest and at least once in the nose, police said. The victim's injuries were not life-threatening, police said.
Most of the attack was captured on surveillance video at the store where the two worked, police said.
Bertrand was being held at the Mesa County jail on $25,000 bond.
There was no home phone number under Bertrand's name. An official at the jail said he couldn't say whether Bertrand had an attorney.