here's my "nightline" coanchor byron pitt. >> reporter: on the three-point line and to his fans, jayu? >> i was a right. >> more than all right. >> reporter: a two-time all-american at duke, williams led his team to a national championship. at 20, he was the second pick in the nba draft by the chicago >> jay williams from duke university. >> reporter: just weeks after s rookie season ded, jay's career,promise, cut short by a devastating motorcycle accident. >> bulls guard jay a motorcycle accident -- >> the second player taken in the draft transported t the hospital in critical condition. >> these injuries could definitely change his career permanently. >> reporter: from what seemed to be gone, jay has found a new purpose on a familiar court. mentoring a group of young men as part of the yoube series "best shot." >> i remember that day. it validated, i had made life >> reporter: oune 19th, 2003, jay was mting his agent. no fear, no license, no helmet. >> as i look up from the spdometer going 65, 70 miles per hour, i'm headed towards a utility pole. i'm headed towards my fate. >> repo

. >> hire now, byron pitts. >> good evening. we begin tonight in the plains of south africa where rare white ryan nopes are hunted for the sale of their horns. bob woodruff was there last year, and innocent lives hanging in the balance. this jarring scene is becoming more and more common throughout south africa. it may look like this animal is in distress. but farmers here claim the extreme measure may be the only way to save the rhino. what is clear -- the national parks in south africa are under siege. all for this. worth over $300,000 on the black market. it's a brutal trade. poaching is a story we all know. but now this country, the courts are a complicated story and the bad guys may be even worse than you thought. >> people kill for v for this. >> reporter: so are some says the good guys might have ulterior motives. >> this is the gold and the diamonds of the modern world. >> reporter: and hanging like a cloud over everything, one photograph that maybe signal the very last organization anyone needs here in south africa, isi

byron pitts reporting. >> i was if tn the hallway with friends.y year back. i saw he looked a little upset. he told me there had been another shooting in santa fe. >> there has been another school shooting in america -- >> after you hear that, i kind of felt like time froze for a second. it was kind of another burst of a bubble for us. >> reporter: the familiar images. >> there are multiple fatalities -- >> reporter: students shaken outside. >> i kind of felt like it was eventually going to happen here too. >> when does it stop? >> reporter: ten more people gunned down in at least the 22nd school shooting this year. >> at this point, i've learned the importance of just cherishing every second of your life. and every moment of your life is invaluable. as i walk across the stage, i think i'll an little nervous knowing that so many people will be looking at me as my name is called. >> reporter: graduation day has come for the seniors of marjory stoneman douglas. >> you have to put it on me? >> of course, that's good luck. it looks really nice. >> it

here's byron pitts. >> this is a moment that as a parent you should be happy, having your kid receivingr's only son was gunned down along with 16 students and faculty in his school nearly four months ago. he was a confident 17 year old who loved basketball. he was loved by many. friends describe him as the light in the room. >> he was so comfortable in his own skin. he was just glowing all the time. everyone wanted to be just like him, you know? >> here we are. >> reporter: his family says joaquin had been looking forward to this moment. graduation day at marjory stoneman douglas, for a long time. amidst the sea of graduates, patricia oliver. >> i step in for joaquin oliver. >> reporter: doing what she never thought she'd have to do, chosen by the family to take her son's place on stage. to accept his diploma. [ applause ] a moment lost on no one. the olivers are now trying to pave the way forward, traveling the country, creating public art installments called the walls of demand. >> he is right there with us. i became a tool that joaquin can use to still have a voice. with me being an