article_snippet: Cambridge police officer Brendan O'Hearn joined Cambridge police officer Brendan O'Hearn, and took over applying chest compressions.
article_snippet: Cambridge police officer Brendan O'Hearn
article_snippet: There was some type of wound to Cambridge police officer Brendan O'Hearn head," O'Hearn said.
article_snippet: " O'Hearn " O'Hearn added.