they gathered on campus in de kalb to remember the shocking 2008 valentine's day shooting spree. a former graduate student walked into a class, opened fire, killing five students and wounding 22 others. he then turned the gun on himself. >>> and new details this morning in the death of whitney houston. the doctors who wrote her prescriptions and the pharmacies which filled those prescriptions could soon be forced to turn over those records. investigators want to find out if houston was getting too many drugs from any one particular doctor. abc's jim avila has more on the investigation from beverly hills. >> reporter: room 434 at the beverly hilton hotel is -- room 434 at the beverly hilton hotel is out of service indefinitely. security not allowing sightseers on the fourth floor, where whitney houston died. >> excuse me, sir. this area is off limits. >> reporter: and the suite, evidence fully gathered, is closed to guests. outside, a memorial to the troubled singer, visited by loyal fans and music royalty. that's paul mccartney quietly laying yellow roses and softly blowing a kis