The minutes after a black Minnesota man was shot and killed during a traffic stop in the Twin Cities — the second fatal encounter in the U.S. this week between a black man and police — were broadcast live by his girlfriend on Facebook. Philando Castile, 33, was shot in the St. Paul suburb of Falcon Heights on Wednesday night, and later declared dead.

What follows is a look at what happened and the ongoing investigation:

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THE SHOOTING AND VIDEO

Diamond Reynolds, Castile's girlfriend, said in the initial video and in subsequent interviews that they were driving through Falcon Heights with her 4-year-old daughter in the back seat when they were pulled over by police for what they were told was a broken tail light.

Reynolds said Castile was complying with the officer's request for identification when he brushed up against his concealed firearm near his back pocket. Soon after informing the officer that he had a legally permitted firearm, Castile was shot four or more times, Reynolds said. The first seconds of her broadcast on Facebook showed Castile first slumping and then sitting motionless in the driver's seat.

Neither state investigators nor the St. Anthony Police Department, whose officer fired the shots, have revealed any information about the situation, including the officer's name. The state Department of Public Safety has not confirmed whether Castile had a permit to carry.

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PHILANDO CASTILE

Castile, who was just a few days shy from celebrating his 34th birthday, had worked for St. Paul Public Schools for a decade, recently rising to cafeteria supervisor at a Montessori school, where teachers said he was lovingly called "Mr. Phil" by students.

Aside from a handful of driving-related offenses over the past decade, he did not have a record and there was no indication he'd ever had a tense run-in with police.

Protesters who surrounded the Minnesota governor's residence Thursday to call for swift action against the officers involved were appalled that Castile's record was a subject at all.

"I don't give a damn. He didn't deserve to die. For a traffic stop?" said Brian Herron, a reverend at a local Baptist church.

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DIAMOND REYNOLDS

Reynolds' cellphone video showed Castile covered in blood in the seat next to her, the officer screaming expletives after shots were fired and more. The footage also showed Reynolds and her calm interactions with the officer still brandishing a pistol before she later broke down and yelled in despair, hoping Castile had not died.

She told reporters that she spent much of the night at a police station and that she and her daughter were separated as they were pressed for information.

Reynolds said Castile wasn't her daughter's birth father but treated them both as family. She described him as her best friend, and was distraught speaking about his death.

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FALCON HEIGHTS

Falcon Heights is a small suburb of St. Paul and host to the annual State Fair. A town of just 5,000, it's also home to a subsection of the massive University of Minnesota campus. Due to its small size, Falcon Heights is served primarily by the nearby St. Anthony Police Department.

Like most of Minnesota, it's a primarily white town. On average, median incomes in Falcon Heights are larger than Minnesota as a whole.

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THE OFFICERS

Little is known about the officers who stopped Castile's car Wednesday night. Neither the local police nor state investigators at the Bureau of Criminal Apprehension have released their names, though Minnesota's top public safety official said that could come later Thursday.

St. Anthony interim police chief Jon Mangseth said the officer who fired the shots had been placed on administrative leave.

Reynolds described that officer as an Asian man who was roughly 5 feet 6 inches tall.

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FOOTAGE

Reynolds' roughly 9-minute feed, which was archived, could play a major role in the investigation. What other footage could be available to investigators remains to be seen.

One possibility is video from dashboard cameras: All St. Anthony police squad cars are equipped with the technology, department office manager Kim Brazil confirmed, but no officers are wearing body cameras.