Mrs Moore, 44, had tried to kill herself previously and had spent time in psychiatric hospitals. In a recorded message left behind for her boyfriend she wept and talked about her belief that she was the Antichrist.

Mrs Moore’s ex-husband said she had attempted to commit suicide at the range before and had been barred. A lawyer for the indoor range rejected the claim.

In a second tape marked for police attention Mrs Moore left instructions leading them to a storage facility where she left 63 journals documenting her mental torment.

Police confirmed that Mrs Moore had been committed to protective custody under the Baker Act — the equivalent of being sectioned in Florida — in 2002 over an unspecified incident.

Commercial shooting ranges are not required by law to carry out background checks on customers before renting them weapons.