She was one of two mares held for fertility treatment before being returned to the HMA.
A report by The Grand Junction Daily Sentinel said she spooked and hit her head on a pipe panel during feeding.
She received an initial dose of GonaCon Equine and the contractors were following the CAWP according to the story.
A second dose was to be given after 30 days, which would violate the 90-day interval of the 2017 labeling amendment.
The other mare was treated with PZP and returned to the range.
The BLM has not updated the figures at the gather page, which should indicate 140 horses captured, 98 shipped, 38 released and four dead, for a net removal of 102.
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Western Horse Watchers Association 