Writing a police report on the incident, Christopher Wilson said his shift had ended on Sunday when he was told about a SWAT team at Mr Parscale’s home, who would not surrender to police.
Mr Wilson went to assist the SWAT team, stationed outside the address in Fort Lauderdale, Florida, from where Mr Parscale’s wife fled following his comments about shooting himself.
The officer was reported to have persuaded the former Trump campaign manager to come out from his house after an hours-long standoff, which led to his arrest.
Body camera footage showed officers pushing Mr Parscale to the ground as he stepped outside his home prior to that arrest.
Ms Parscale told police that the 44-year-old had been stressed and had turned to alcohol to manage post-traumatic stress disorder, according to the police report.
She went to seek help on Sunday when he made comments about shooting himself, which led to the 911 call.
Police found 10 guns that were removed from the home, where Ms Parscale told police she sustained bruising from her husband in an altercation that week.
Mr Parscale was hospitalised later on Sunday, having been declared a threat to himself and others under state law.
He was demoted from his position as Mr Trump’s campaign manager in July following a largely unattended comeback rally in Tusla, Oklahoma, that was said to have annoyed the president.
Mr Parscale remained part of the campaign, helping run its digital operation, prior to Sunday’s arrest.