A man is due in court later today charged with the murder of healthcare assistant Sharon Wall, who was stabbed while working in a psychiatric hospital.
Ryan Matthews, 61, of Horton Road, Gloucester, will appear before magistrates in Cheltenham this morning.
Matthews was arrested shortly after the incident at an inpatient unit at Wotton Lawn Hospital hospital on Wednesday.
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Detectives have charged 19-year-old Bilal Mumin with murder, grievous bodily harm and possession of an offensive weapon.
Members of the RMT on Arriva Rail North (Northern) walked out for 24 hours, with more stoppages due on Thursday and Saturday.
Police said a dozen shots were fired, but no arrests have been made and they are looking for a dark vehicle.