Prosecutor: Philando Castile Investigation Top Priority

Diamond Reynolds, the girlfriend of Philando Castile of St. Paul, cries outside the governor's residence in St. Paul, Minn., on Thursday, July 7, 2016. Castile was shot and killed after a traffic stop by police in Falcon Heights, Wednesday night. A video shot by Reynolds of the shooting went viral. AP Photo/Jim Mone

FALCON HEIGHTS, Minn.—A Minnesota prosecutor said Friday he has asked for a “prompt and thorough investigation” following the fatal police shooting of a black motorist whose girlfriend streamed the gruesome aftermath of the shooting in a St. Paul suburb live on Facebook.

Ramsey County Prosecutor John Choi said the video is part of the investigation into the shooting Wednesday night of Philando Castile. The school cafeteria supervisor was shot “for no apparent reason” while reaching for his wallet after telling the officer he had a gun and a permit to carry it, his girlfriend said in the video.

Choi declined to comment on the investigation. Police also have refused to release details, including what led up to the traffic stop, why Castile was pulled over or why the officer drew his gun.

Hundreds gather at the JJ Hill Montesorri School, July 7, 2016, in St. Paul, Minn. for a vigil following the shooting death by police of Philando Castile Wednesday night in Falcon Heights, Minn. after a traffic stop by St. Anthony police. AP Photo/Jim Mone