The website it's self is kind of in question here, but you quote this but ignore the very first line of the article that says
And considering this was his neighbour and considering he refereed to the deceased as "'the nicest guy" it's safe to assume he knew the guy on some level to at least know what his voice sounded like.A witness says he heard the sarcastic final words of a Texas student moments before he was shot dead by a college police officer.
All I got is questions. Why was Redus chasing this carter dude OFF campus ? Why was 6 shots needed to put this guy down ? What was he doing to justify 6 shots or was it the cop acting out of line ? So little information to go on.