AUGUSTA, Maine — Protective orders that required him to relinquish his guns. A severe head injury that he said impaired his cognitive function. A yearslong trail of abuse allegations from two ex-wives, documented in hundreds of pages of court records.

David Brouillette’s past was full of red flags when he sought a job at US Immigration and Customs Enforcement last year. But the agency, which was undertaking a massive push to expand the ranks of US immigration agents, hired him anyway. It’s unclear whether ICE didn’t know or didn’t care about the warning signs.

Now, Brouillette’s troubled background has come to light after he was identified as the agent who shot and killed Johan Sebastián Durán Guerrero during a botched traffic stop on July 13 in Biddeford, Maine...

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